低速及间歇工作设备，其轴和轴瓦的接触点为每平方厘米（）点。
A.1~1.5
B.2~3
C.3~4
D.4~5
参考答案：A
----I am sorry to tell you that I can’t arrive on time as planned due to the delay of the flight. You have to look after your brother yourself tomorrow.
----Don’t worry, uncle. There’s .
A．no exception
B．no wonder
C．no doubt
D．no hurry
不管在什么情况下，奖励制度都具有明显的（）作用。
