地下天然气管道的常用管材是(  )。

地下天然气管道的常用管材是(  )。A.聚乙烯管 B.螺旋缝焊接钢管 C.无缝钢管 D.直缝焊接钢管

查看答案

[A]need[B]problem[C]activity[D]question

[A]need[B]problem[C]activity[D]question

查看答案

____inawhiteuniform,helooksmorelikeacookthanadoctor.

____inawhiteuniform,helooksmorelikeacookthanadoctor.A.Dressed B.Todress C.Dressi

查看答案

Proudasthebossis,hewillhaveto__________hiswrongdoingsoneday.

Proudasthebossis,hewillhaveto__________hiswrongdoingsoneday.A.askfor B.answerfor

查看答案