型钢桩的常用断面形式为（）。
A.H型
B.U型
C.Z型
D.I型
参考答案：A, D
洁净厂房的功能是什么？
He lost all his money. The only thing he could do was to call his wife for help at this moment.
A．being called B．to be called C．calling D．call
