根据《建筑业企业资质管理规定》，施工总承包序列企业资质设( )等级。 A．特级 B

What do you know about the man [A] He was not born in Beijing. [B] His parents like Beijing better than he does. [C] Beijing is the place where his parents were born.

若一个数平方等于它的倒数，那么这个数是______．

With the development of agriculture, the people ________ village I taught are now living a happy life.

A．in whose

B．whose

C．in which

D．which

简述如何对卷扬式启闭机钢丝绳进行养护。

压铸模的模体有哪些主要构件？