Line canal is by make shoe, bushing, sieve tube , buckle the composition such as pipe nipple.衬管是由引鞋 、 套管 、 筛管 、 倒扣短节等组成....

sieve tube的音标：sieve tube的英式发音音标为：[siv tju:b]sieve tube的美式发音音标为：[sɪv tub]...

筛管...