铜管加工时，不得采用（）方法进行切割和坡口。
A.锉刀
B.手工钢锯
C.车床
D.氧乙炔焰
参考答案：D
___________, he would have been fired.
A．Had he lied to the boss
B．Did he lie to the boss
C．If he has lied to the boss
D．If he lies to the boss
裂缝控制主要针对（）及受拉构件。
A．速性混凝柱
B．土木混合物
C．混凝土梁
D．钢材架构梁
