（）不能承受轴向载荷。
A．调心球轴承
B．深沟球轴承
C．圆柱滚子轴承
D．圆锥滚子轴承
参考答案：C
——Why is the classroom so dirty?
——Sorry, Sir. It _____ yesterday. We forgot to do it.
A．doesn't clean
B．didn't clean
C．isn't cleaned
D．wasn't cleaned
一般钢结构指的是什么？其工程量计算单位是什么？
