治疗气虚型胎动不安的代表方剂：（） A.寿胎丸 B.保阴煎 C.固阴煎 D.举元煎

The old couple have been married for 40 years and never once ______ with each

Other.

A．they had quarreled

B．they have quarreled

C．have they quarreled

D．had they quarreled

Which of the following is NOT true about Andrew Carnegie().

A.He thought individuals should progress through hard work.

B.He felt that the wealthy should use their fortunes for the benefit of society.

C.He preferred to provide opportunities that would allow others to help themselves.

D.He thought that charity was a good way to help the poor.

螺杆式制冷压缩机油压较低，可能是什么原因？

三相异步电动机直接启动电路中，熔断器的熔体额定电流，应是电动机额定电流的（）。

A、2.5-4倍

B、1倍

C、4-7倍

D、1.5-2.5倍

挡车设施的连接绳采用Φ（）mm油丝绳。