题目内容

下列各项中,属于外来原始凭证的有( )。

A. 销售商品发票
B. 火车票
C. 缴纳电费取得的增值税专用发票
D. 汇总原始凭证
E. 购进材料取得的普通发票

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A ( )is one that is controlled by hand.

( )are commonly used in motor control applications to start and stop motors.

( )provide visual indication of the status for many motor-controlled processes permitting personnel at remote locations to observe the current state of the operation.

The difference between a push button and selector switch is( ).

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