单项选择题

传动轴他所承受的应力为切应力和扭转应力,他的载荷的性质是承受循环冲击载荷,受载的状态主要为轴颈摩损,主要的失效形式有疲劳断裂、过量变形、轴颈磨损。（）

A．对
B．错

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单项选择题

The author believes that ________ . A.
library resources should be used frequently and completely B.
library resources cannot be made good use of if they are not available to us C.
one is supposed to be aware of the library resources that are usually not available D.
one is supposed to have good knowledge and make good use of resources

单项选择题

客运路线的非直线系数有可能小于。（）

A．对
B．错