轴带发电机的转子轴与主机轴之间（）。
A．直接机械相连
B．通过增速齿轮转动机构机械相连
C．通过减速齿轮转动机构机械相连
D．直接电连接
参考答案：B
Mr. Green _____ to the manager now. You'd better call him later. [ ]
A. talk
B. talked
C. is talking
D. was talking
混合列车编挂装载危险货物的车辆有何限制和规定？
