ELBOW,BW,90 DEG,LR,STD WALL,C.STL GB/T 8163-20 TO AP SPEC 4W
ELBOW 90 304L SCH.20 BW LR分别代表什么意思?
ELBOW+45+LR+SMLS+BW中lr是什么意思
弯头“ Elbow 90- BW 90LR ELBOW sch.40,50NB SS"里NB 50NB又等于多少呢?
90 elbow welded bw s-std ss astm a403 gr.wp304 cryogenic ser
90 DEG ELBOW STAINLESS STEEL BUTT WELD SCH.10 20" ASTM A403
90DEG L/R 还有一个90DEG S/R ELBOW是啥意思
elbow-to-elbow life?
英语翻译LW PIPE;BOSS;STUB END;ELBOW 90 LR;REDUCER CONCENTR;EQUAL
elbow to
一个管件的描述45 ELL LR,BW,304LSS ASTM A403-WP304L-S,ASME B16.9 S-4
deg.c是什么单位
Let‘s go to the Great Wall by bus,(shall we/arent’we/don”t w