弯头“ Elbow 90- BW 90LR ELBOW sch.40,50NB SS"里NB 50NB又等于多少呢?
弯头“ Elbow 90- BW 90LR ELBOW sch.40,50NB SS"里NB 50NB又等于多少呢?
ELBOW 90 304L SCH.20 BW LR分别代表什么意思?
90 elbow welded bw s-std ss astm a403 gr.wp304 cryogenic ser
ELBOW+45+LR+SMLS+BW中lr是什么意思
英语翻译LW PIPE;BOSS;STUB END;ELBOW 90 LR;REDUCER CONCENTR;EQUAL
英语翻译1.PPR SOCKET TYPE 90° ELBOW Size:40mmNB QTY:50NOS.2.PPR
90 DEG ELBOW STAINLESS STEEL BUTT WELD SCH.10 20" ASTM A403
SB NB
elbow-to-elbow life?
NB电源是?NB是什么英文单词缩写?
We have sweaters _____ all colors_____ $ 50 each. [ &nb
We have sweaters ________ all colors ________ ¥50 each. [&nb