pigging valve造句

例句与造句

1. Pig receiver & launcher shall be horizontal , and the diameter of pig valves shall be equal to the inner diameter of the pipe cleaned
   收发球筒采用卧式平放，收、发球阀的直径应等于被清扫管线的内径。
2. It's difficult to find pigging valve in a sentence. 用pigging valve造句挺难的