钢结构制作和安装单位应按规定分别进行高强度螺栓连接摩擦面的( )试验和复验,其结果应符合设计要求。
A.扭矩系数
B.紧固轴力
C.弯矩系数
D.抗滑移系数
参考答案:D
—What about playing basketball this afternoon,Tom?
—I’d rather________at home than________ football. It’s too hot outside. [ ]
A. stay; playing
B. stay; play
C. to stay; to play
D. to stay; playing
球铁管能进行机械加工,其表面硬度HB不得大于()
A.150
B.295
C.230