单项选择题

键联接的主要用途是:使轴与轮毂之间( )。
A、沿轴向固定并传递轴向力
B、沿轴向作相对滑动
C、沿周向固定并传递扭距
D、安装拆卸方便

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试车成功后要及时断开电源，让电动机停转，以确保安全。( )

答案：正确

单项选择题

What does the Salvation Army do with red kettles ? A.
Volunteers of the salvation army put a red kettle at the public library.
B.
Volunteers of the salvation army put a red kettle at a prominent place of public, gathering and ring a bell to urge passers-by to drop money into the kettle in the spirit of Christmas. C.
Volunteers gather and ring a bell to urge passers-by to drop books into the kettle in the spirit of Christmas. D.
Volunteers gather and ring a bell to urge wealthy people to drop money into the kettle in the spirit of Christmas.