吹气管一般可用内径为φ（）毫米的无缝钢管 A.3--6 B.6--15 C.15--_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

吹气管一般可用内径为φ（）毫米的无缝钢管

A.3--6

B.6--15

C.15--20

D.1--3

答案

参考答案：B

选择题

_____ of us felt very tired but quite happy after _____ sports meeting.[ ]

A. Everyone, a two days'

B. Every one, the two days

C. None, the two-day

D. None, a two-day's

问答题简答题

简述表干的概念。