輸送機械_百度百科
揚州瑞吉輸(shu)送機(ji)(ji)(ji)械設備有限公司主(zhu)營(ying)-提(ti)升(sheng)(sheng)機(ji)(ji)(ji),垂直提(ti)升(sheng)(sheng)機(ji)(ji)(ji),輸(shu)送機(ji)(ji)(ji)械,輸(shu)送設備-輸(shu)送機(ji)(ji)(ji)械設備,是專(zhuan)業的提(ti)升(sheng)(sheng)機(ji)(ji)(ji)生(sheng)產廠家(jia),所售提(ti)升(sheng)(sheng)機(ji)(ji)(ji)被(bei)譽(yu)為三星提(ti)升(sheng)(sheng)機(ji)(ji)(ji)輸(shu)送機(ji)(ji)(ji)械-0514-86398980。
輸送設備-輸送機械-提升機生產廠家
中國輸(shu)(shu)(shu)送(song)機(ji)網是輸(shu)(shu)(shu)送(song)機(ji)行(xing)(xing)業(ye)的專(zhuan)業(ye)資訊服務,中國輸(shu)(shu)(shu)送(song)機(ji)網為整個行(xing)(xing)業(ye)提供懸掛輸(shu)(shu)(shu)送(song)機(ji)、帶式輸(shu)(shu)(shu)送(song)機(ji)、鏈(lian)式輸(shu)(shu)(shu)送(song)機(ji)、輥筒輸(shu)(shu)(shu)送(song)機(ji)、移動式輸(shu)(shu)(shu)送(song)機(ji)、刮板輸(shu)(shu)(shu)送(song)機(ji)、螺旋輸(shu)(shu)(shu)送(song)機(ji)。
中國輸送機網
中國輸(shu)(shu)(shu)送(song)(song)(song)設(she)(she)備網(wang)擁有螺旋輸(shu)(shu)(shu)送(song)(song)(song)機(ji)、刮板輸(shu)(shu)(shu)送(song)(song)(song)機(ji)、皮帶(dai)輸(shu)(shu)(shu)送(song)(song)(song)機(ji)等輸(shu)(shu)(shu)送(song)(song)(song)機(ji)械資訊(xun),立足(zu)于(yu)輸(shu)(shu)(shu)送(song)(song)(song)設(she)(she)備領域,為(wei)各類(lei)輸(shu)(shu)(shu)送(song)(song)(song)生產線(xian)建設(she)(she)提供輸(shu)(shu)(shu)送(song)(song)(song)機(ji)及輸(shu)(shu)(shu)送(song)(song)(song)帶(dai),輸(shu)(shu)(shu)送(song)(song)(song)鏈,傳動(dong)設(she)(she)備等輸(shu)(shu)(shu)送(song)(song)(song)配件選型。
中國輸送設備網
輸送設(she)(she)備(bei)廠家直銷傳送帶輸送機,上海挪班自(zi)動(dong)化流(liu)水(shui)(shui)線(xian)設(she)(she)備(bei)有限公司(si)網提供輸送設(she)(she)備(bei),傳送帶,流(liu)水(shui)(shui)線(xian),輸送機行業資訊信息(xi);承接輸送設(she)(she)備(bei)流(liu)水(shui)(shui)線(xian)系統工程(cheng)咨詢:400-699-6686。
輸送設備_傳送帶_流水線_輸送機_上海挪班自動化設備有限公司網
輸送(song)機(ji)(ji),螺(luo)旋輸送(song)機(ji)(ji)是無錫市長榮輸送(song)機(ji)(ji)械有限公(gong)司(si)主(zhu)要產品(pin).擁有多(duo)年生產螺(luo)旋輸送(song)機(ji)(ji)的(de)豐富經驗,信(xin)譽和業績贏得眾(zhong)多(duo)企業的(de)信(xin)任,歡(huan)迎選購輸送(song)機(ji)(ji).。
輸送機|螺旋輸送機|無錫市長榮輸送機械有限公司
輸(shu)送(song)(song)機(ji)(ji)生(sheng)(sheng)產廠家浙(zhe)江湖(hu)州恒遠機(ji)(ji)械設(she)備廠是一家專業生(sheng)(sheng)產皮帶輸(shu)送(song)(song)機(ji)(ji),輥筒輸(shu)送(song)(song)機(ji)(ji)供應商,提供輸(shu)送(song)(song)機(ji)(ji)安裝服務。企業生(sheng)(sheng)產的輸(shu)送(song)(song)機(ji)(ji)價(jia)格實惠(hui),質(zhi)量上(shang)乘。
輸送機|皮帶輸送機|輥筒輸送機生產廠家供應商-浙江湖州恒遠機械
中國輸送(song)(song)(song)設(she)備網提(ti)供皮帶輸送(song)(song)(song)機、螺(luo)旋輸送(song)(song)(song)機、刮板輸送(song)(song)(song)機、輸送(song)(song)(song)帶等輸送(song)(song)(song)機械及輸送(song)(song)(song)配件供求,為企業(ye)帶來各(ge)類(lei)輸送(song)(song)(song)生產線(xian)裝(zhuang)配選型信息,是輸送(song)(song)(song)設(she)備企業(ye)電(dian)子營銷的平臺(tai)。
中國輸送設備網-輸送機輸送帶輸送鏈等輸送設備商貿
昆(kun)山誠(cheng)展(zhan)自(zi)動(dong)化輸送設備(bei)科(ke)技有限公司堅持以(yi)科(ke)技為先導(dao),以(yi)輸送設備(bei)、自(zi)動(dong)化專(zhuan)機專(zhuan)業設計、自(zi)動(dong)化流水線、表(biao)面(mian)涂裝、電子(zi)裝聯設備(bei)研究開(kai)發(fa)為的公司。
輸送設備-誠展自動化科技
無錫市(shi)春(chun)雷輸(shu)(shu)送(song)(song)機(ji)(ji)(ji)械廠有限公司主要產品有各(ge)種型號的帶式輸(shu)(shu)送(song)(song)機(ji)(ji)(ji)、新型的大傾角(jiao)輸(shu)(shu)送(song)(song)機(ji)(ji)(ji)、斗式提升機(ji)(ji)(ji)、螺旋輸(shu)(shu)送(song)(song)機(ji)(ji)(ji),板式輸(shu)(shu)送(song)(song)機(ji)(ji)(ji)、鏈(lian)斗輸(shu)(shu)送(song)(song)機(ji)(ji)(ji)、埋刮板輸(shu)(shu)送(song)(song)機(ji)(ji)(ji)等。并與多(duo)家。
輸送機,螺旋輸送機-無錫市春雷輸送機械廠有限公司
中國輸(shu)送(song)(song)機(ji)械(xie)網是(shi)國內權威(wei)的(de)輸(shu)送(song)(song)機(ji)械(xie)設備行業平臺,匯集了輸(shu)送(song)(song)設備、輸(shu)送(song)(song)帶、輸(shu)送(song)(song)機(ji)、輸(shu)送(song)(song)機(ji)械(xie)配件(jian)、輸(shu)送(song)(song)鏈、水泥輸(shu)送(song)(song)機(ji)、傳(chuan)動件(jian)、傳(chuan)動帶等系(xi)列產品的(de)供應求購,歡迎。
中國輸送機械網-輸送機械_輸送帶_輸送設備_輸送機械設備
無錫市春雷輸(shu)送(song)機(ji)(ji)械廠主要(yao)產品有各種(zhong)型號的輸(shu)送(song)機(ji)(ji)械:包括污泥(ni)處(chu)理設備(bei)、新型的大傾角、帶式(shi)、螺(luo)旋式(shi)、板(ban)式(shi)輸(shu)送(song)機(ji)(ji)械、可伸縮、升(sheng)降式(shi)移(yi)動(dong)皮帶機(ji)(ji)、斗(dou)式(shi)提升(sheng)機(ji)(ji)、電動(dong)。
輸送機械,污泥處理設備-無錫市春雷輸送機械廠
主要(yao)產(chan)(chan)品:輸(shu)送設(she)備,組裝線(xian),自動化生(sheng)產(chan)(chan)線(xian),噴涂線(xian),吸塵設(she)備,流水線(xian)生(sheng)產(chan)(chan)廠(chang)家東莞榮源自動化科技有限(xian)公司。
輸送設備_組裝線_自動化生產線_噴涂線_吸塵設備_流水線生產廠家-
㊣鄭(zheng)州華(hua)邦機(ji)械歡(huan)迎您!15333827088專業的鄭(zheng)州輸送設(she)備(bei)廠家,生(sheng)產皮帶(dai)輸送機(ji),膠帶(dai)輸送機(ji),螺旋輸送機(ji),大(da)傾角輸送機(ji)及(ji)各種(zhong)皮帶(dai)機(ji)配件,斗式提升機(ji)以(yi)及(ji)相關的破碎(sui)篩分設(she)備(bei),。
機,皮帶式輸送機價格,膠帶輸送機型號,皮帶機報價-鄭州輸送設備廠
我公司專業(ye)生產各種輸送(song)機(ji)(ji)械,是帶式輸送(song)機(ji)(ji)械的(de)專業(ye)生產廠家,我公司擁有大(da)型鋼材預處理,大(da)型卷板(ban)機(ji)(ji),自動(dong)焊接機(ji)(ji),托輥生產線等先進(jin)工藝裝備(bei)以及各種完(wan)善的(de)檢測手(shou)段,歡(huan)迎。
專業生產輸送機械|輸送設備-河北魯梅卡輸送機械制造有限公司
濰坊(fang)昊天機(ji)械(xie)設備有限公(gong)司是(shi)一(yi)家現代(dai)化高科技(ji)民(min)營獨資企業,主要生產輸送(song)機(ji)械(xie),自動配煤設備等產品,是(shi)山東有實(shi)力的自動配料工(gong)業自動化設備制造商之一(yi)。
輸送機械,自動配料,自動配煤設備-濰坊昊天機械設備有限公司
河北(bei)鑫山輸送機械有(you)限公(gong)司始建于1958年,前身為(wei)棗強縣機械廠(國(guo)家(jia)較早(zao)建設的軍工企(qi)業),2001年改(gai)制為(wei)有(you)限公(gong)司。公(gong)司注冊商標“鑫山”,現為(wei)中國(guo)重(zhong)型機械工業協(xie)會帶式(shi)。
首頁,河北鑫山輸送機械有限公司
建德輸(shu)送(song)機(ji)械(xie)(xie)設(she)(she)備有限公(gong)司是一家較早(zao)生產輸(shu)送(song)機(ji)械(xie)(xie)、輸(shu)送(song)設(she)(she)備的(de)產家之一,本公(gong)司以全優的(de)質量(liang),優質服務(wu),熱烈歡迎前(qian)來惠顧指導,歡迎來電咨(zi)詢輸(shu)送(song)機(ji)械(xie)(xie)、輸(shu)送(song)設(she)(she)備業(ye)務(wu)。
輸送機械|輸送設備浙江省建德市輸送機械設備有限公司
供(gong)應(ying)供(gong)應(ying)鋼繩芯膠帶(dai)(dai)(dai)輸(shu)(shu)送(song)機(ji)[輸(shu)(shu)送(song)機(ji)械(xie)設備][2010/03/28]供(gong)應(ying)供(gong)應(ying)伸(shen)縮帶(dai)(dai)(dai)式輸(shu)(shu)送(song)機(ji)[輸(shu)(shu)送(song)機(ji)械(xie)設備][2010/03/14]供(gong)應(ying)供(gong)應(ying)轉向(xiang)式皮帶(dai)(dai)(dai)輸(shu)(shu)送(song)機(ji)[輸(shu)(shu)送(song)機(ji)械(xie)設備。
中國礦山輸送機械網-首頁
中國輸(shu)送(song)(song)(song)機(ji)(ji)網匯集了國內外上千家輸(shu)送(song)(song)(song)機(ji)(ji)企(qi)業,每日(ri)提供(gong)大(da)量有效輸(shu)送(song)(song)(song)機(ji)(ji)供(gong)求商機(ji)(ji)及產品報價,中國輸(shu)送(song)(song)(song)機(ji)(ji)網是中國權威的輸(shu)送(song)(song)(song)機(ji)(ji)行業門戶,中國輸(shu)送(song)(song)(song)機(ji)(ji)網是輸(shu)送(song)(song)(song)機(ji)(ji)行業制造(zao)商。
輸送機-中國輸送機網-眾多輸送機企業盡在中國輸送機網
上海傳卡機(ji)(ji)械設備有限公司(si)多年來一直專(zhuan)注(zhu)于輸(shu)送(song)機(ji)(ji)行業(ye),多項產品獲得CCC認(ren)證,本公司(si)專(zhuan)業(ye)生產:板(ban)鏈(lian)輸(shu)送(song)機(ji)(ji)、倍速鏈(lian)輸(shu)送(song)機(ji)(ji)、輥筒輸(shu)送(song)機(ji)(ji)、插件(jian)流水線、擱板(ban)流水線、烘道。
輸送機-流水線-生產流水線-輸送設備-上海傳卡機械設備有限公司-
湖(hu)州(zhou)創(chuang)力物流機(ji)(ji)(ji)械(xie)工程有限公司主導(dao)產品,輸(shu)送機(ji)(ji)(ji)械(xie),輸(shu)送機(ji)(ji)(ji),輸(shu)送設備,以(yi)全心(xin)全意(yi)的服務來換取廣大用戶的信(xin)賴及(ji)認可。電話:0572-3312866。
輸送機械_輸送機設備_輸送設備_輸送機_湖州創力物流機械工程有限
中(zhong)國輸(shu)送(song)帶(dai)(dai)(dai)網提供橡膠輸(shu)送(song)帶(dai)(dai)(dai)、耐熱輸(shu)送(song)帶(dai)(dai)(dai)、食品輸(shu)送(song)帶(dai)(dai)(dai)、PVC輸(shu)送(song)帶(dai)(dai)(dai)等產(chan)品供求,綜合皮(pi)帶(dai)(dai)(dai)輸(shu)送(song)機等輸(shu)送(song)機械及電動滾(gun)筒、傳動帶(dai)(dai)(dai)等輸(shu)送(song)設備信息,為(wei)企業打造優(you)質(zhi)輸(shu)送(song)帶(dai)(dai)(dai)貿易。
中國輸送帶網
河北偉業輸(shu)送機(ji)械有限(xian)公(gong)司專業生產糧(liang)食輸(shu)送機(ji)、清理篩、扒谷(gu)機(ji)、定量包裝秤的廠家(jia),請廣大(da)新老(lao)客戶蒞臨指導。
糧食輸送機清理篩糧食機械專業制造商——河北衡水輸送機械
無錫(xi)建業輕工(gong)機(ji)(ji)(ji)械廠生產成品膜卷(juan)輸(shu)(shu)送機(ji)(ji)(ji)械、卷(juan)繞機(ji)(ji)(ji)接(jie)卷(juan)及向外輸(shu)(shu)送機(ji)(ji)(ji)械、涂(tu)(tu)裝機(ji)(ji)(ji)械設(she)備(bei)、涂(tu)(tu)裝生產線設(she)備(bei)、雙面平面皮帶輸(shu)(shu)送機(ji)(ji)(ji)、懸(xuan)掛輸(shu)(shu)送設(she)備(bei)等,承接(jie)各類涂(tu)(tu)裝設(she)備(bei)工(gong)程。
輸送機械|涂裝設備-無錫建業輕工機械廠為您提供涂裝機械及輸送
南京輸送(song)機公(gong)(gong)司是南京輸送(song)機和輸送(song)機械的(de)專業生產商,公(gong)(gong)司以的(de)產品質量和服務(wu)態度嬴廣大輸送(song)機用戶的(de)一致(zhi)好評(ping)。
流體輸送機械課件_百度文庫
專業生產輸送(song)(song)(song)機及輸送(song)(song)(song)機械設備,包(bao)括:螺旋(xuan)輸送(song)(song)(song)機、皮帶輸送(song)(song)(song)機、網帶輸送(song)(song)(song)機、鏈式輸送(song)(song)(song)機、刮板輸送(song)(song)(song)機、滾(gun)筒輸送(song)(song)(song)機、輥道輸送(song)(song)(song)機,價格合理,服務完善,歡迎(ying)廣(guang)大(da)客戶前來。
南京輸送機和輸送機械的專業提供商
河北(bei)維業(ye)輸(shu)送(song)機(ji)(ji)有限公司,主要生(sheng)產皮(pi)帶(dai)輸(shu)送(song)機(ji)(ji)、轉彎皮(pi)帶(dai)輸(shu)送(song)機(ji)(ji)、滾筒輸(shu)送(song)機(ji)(ji)、鋼帶(dai)輸(shu)送(song)機(ji)(ji)、塑(su)料模塊式輸(shu)送(song)機(ji)(ji)、頂板鏈輸(shu)送(song)機(ji)(ji)及輸(shu)送(song)機(ji)(ji)零配件、TD75型固(gu)定式膠(jiao)帶(dai)輸(shu)送(song)機(ji)(ji)械。
輸送機和輸送機械設備專業生產廠家-南京燕行機械設備有限公司
網(wang)(wang)帶(dai)(dai)輸送(song)機(ji)廠(chang)家(jia),鏈板(ban)輸送(song)機(ji)公(gong)司(si)(si),烘干機(ji)公(gong)司(si)(si),提升機(ji)生產(chan)(chan)公(gong)司(si)(si),洗碗機(ji)網(wang)(wang)帶(dai)(dai)公(gong)司(si)(si),鏈板(ban)生產(chan)(chan)公(gong)司(si)(si),鏈條生產(chan)(chan)公(gong)司(si)(si),網(wang)(wang)帶(dai)(dai)生產(chan)(chan)公(gong)司(si)(si),乙型網(wang)(wang)帶(dai)(dai)廠(chang)家(jia),餅(bing)干機(ji)網(wang)(wang)帶(dai)(dai)公(gong)司(si)(si),帆布輸送(song)帶(dai)(dai)。
輸送機|輸送機械-河北維業輸送機械有限公司
上海帝頓機(ji)(ji)(ji)械設(she)備(bei)(bei)有(you)限公司專業生(sheng)產(chan)輸(shu)送機(ji)(ji)(ji)械設(she)備(bei)(bei),包(bao)裝設(she)備(bei)(bei),清洗設(she)備(bei)(bei),輸(shu)送帶,輸(shu)送機(ji)(ji)(ji),清洗機(ji)(ji)(ji),工裝線,組(zu)裝線,檢測線,拆解線,卸垛機(ji)(ji)(ji),夾瓶機(ji)(ji)(ji),提升機(ji)(ji)(ji),碼垛機(ji)(ji)(ji),自動化。
金屬網帶鏈條鏈輪不銹鋼模盒輸送設備玻璃機械
無錫市新欣機(ji)械(xie)廠是一家(jia)致力于軟管泵(beng),輸送(song)機(ji)械(xie),粉(fen)體(ti)機(ji)械(xie)等(deng)產品的企業.我公(gong)司(si)擁有專業的團隊(dui),生產的輸送(song)機(ji)械(xie),粉(fen)體(ti)機(ji)械(xie)質(zhi)量有保障,已(yi)廣泛運(yun)用于多(duo)個領域(yu).新欣軟管泵(beng)。
鏈板輸送機|流水線|拆解線|檢測線|傳送帶|輸送機械設備-上海帝
山(shan)東三寶網(wang)鏈(lian)機械廠是生產(chan)輸送機械、鏈(lian)條(tiao)的(de)專業廠家,擁(yong)有專業的(de)技術隊伍和豐富的(de)行業經驗(yan),生產(chan)的(de)鏈(lian)條(tiao),輸送機械遠銷(xiao)全國各地,深受用戶好評!銷(xiao)售熱線:13589909159網(wang)址:。
軟管泵,輸送機械,粉體機械-無錫市新欣機械廠
中國輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)網輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)設(she)(she)(she)(she)備(bei)(bei)(bei)市場,提供(gong)輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)設(she)(she)(she)(she)備(bei)(bei)(bei)供(gong)應信息,輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)資(zi)訊,輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)價格行(xing)情,輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)展(zhan)會,輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)品牌,輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)企業(ye)庫,輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)圖庫,輸(shu)(shu)送(song)設(she)(she)(she)(she)備(bei)(bei)(bei)人才,輸(shu)(shu)送(song)。
輸送機械_鏈條-山東三寶網鏈機械廠
輸(shu)(shu)送(song)機(ji)(ji)(ji)(ji)_提升機(ji)(ji)(ji)(ji)_鏈(lian)板(ban)輸(shu)(shu)送(song)機(ji)(ji)(ji)(ji)-揚州瑞吉在(zai)輸(shu)(shu)送(song)機(ji)(ji)(ji)(ji)械(xie)制造行業技(ji)術、設(she)備齊(qi)全。鏈(lian)板(ban)輸(shu)(shu)送(song)機(ji)(ji)(ji)(ji),滾筒輸(shu)(shu)送(song)機(ji)(ji)(ji)(ji),網(wang)帶(dai)輸(shu)(shu)送(song)機(ji)(ji)(ji)(ji),皮帶(dai)輸(shu)(shu)送(song)機(ji)(ji)(ji)(ji)等各(ge)類非標(biao)自動化輸(shu)(shu)送(song)設(she)備廣(guang)泛(fan)應用于(yu)食品(pin)。
中國輸送設備網
寧津恒(heng)業玻(bo)璃(li)機(ji)械有(you)限公司專業從事生產(chan)(chan)輸送機(ji)、玻(bo)璃(li)機(ji)械及各種網(wang)帶(dai)等輸送設備的廠家,主要(yao)產(chan)(chan)品(pin)有(you)輸送機(ji)、食(shi)品(pin)輸送機(ji)、滾筒輸送機(ji)以(yi)及玻(bo)璃(li)機(ji)械、食(shi)品(pin)機(ji)械、網(wang)鏈、網(wang)帶(dai)等。
皮帶輸送機,滾筒輸送機,垂直提升機找揚州瑞吉輸送機械設備有限
易登網(wang)企業黃(huang)頁-機(ji)械(xie)網(wang)頻(pin)道(dao)為您提供輸送(song)機(ji)相(xiang)關(guan)(guan)分類信息,您可以免費發布輸送(song)機(ji)相(xiang)關(guan)(guan)信息。
寧津恒業玻璃機械有限公司
宏(hong)達皮(pi)帶(dai)輸(shu)送(song)機(ji)[供(gong)應]宏(hong)達皮(pi)帶(dai)輸(shu)送(song)機(ji)2014-09-25新鄉市宏(hong)達振動(dong)設(she)備有限責任公司:皮(pi)帶(dai)輸(shu)送(song)機(ji)用途及特點QD80輕型帶(dai)式(shi)輸(shu)送(song)機(ji)是許(xu)多工業(ye)部門廣泛需(xu)要的(de)輸(shu)送(song)設(she)備。
輸送機-機械網-企業黃頁
昱音機(ji)(ji)械專業生產輸(shu)送(song)(song)機(ji)(ji),皮(pi)帶輸(shu)送(song)(song)機(ji)(ji),輸(shu)送(song)(song)線(xian),流水線(xian),提升機(ji)(ji)等物(wu)流輸(shu)送(song)(song)設備.廠家(jia)直銷食品輸(shu)送(song)(song)機(ji)(ji),膠(jiao)帶輸(shu)送(song)(song)機(ji)(ji),提升輸(shu)送(song)(song)機(ji)(ji),分揀輸(shu)送(song)(song)機(ji)(ji),垂直/移動式/轉彎輸(shu)送(song)(song)機(ji)(ji)等輸(shu)送(song)(song)。
輸送設備振動機械供求信息-中國振動機械網
輸(shu)送機械設(she)(she)(she)備(bei)(bei)生(sheng)(sheng)產廠家浙江湖州吳興合歡物流自動化機械廠是(shi)一家專業生(sheng)(sheng)產輸(shu)送機械設(she)(she)(she)備(bei)(bei)供(gong)應(ying)商,提供(gong)皮輸(shu)送機械設(she)(she)(she)備(bei)(bei)。企業生(sheng)(sheng)產的(de)輸(shu)送機械設(she)(she)(she)備(bei)(bei)價格實(shi)惠,質量上乘。