接地装置的敷设应符合GB50194《建设工程施工现场供用电安全规范》的规定,人工接地体的顶面埋设深度不宜小于()m。
A.0.5
B.0.6
C.1
D.1.5
参考答案:B
All kinds of promotion activities were launched, for the May Holiday Market.
A.intended
B.intending
C.being intended
D.do intend
离心泵的特性曲线有哪几条?