题目内容

已审核或出纳签字的凭证，可以直接删除。()

A. 对
B. 错

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对已记账凭证进行整理，应先取消记账，取消审核签字后，才能做凭证整理。（）

A. 对
B. 错

Valve group parts mainly include ___, _, _, _, and ___.

A. valve
B. valve seat
C. valve guide
D. valve key
E. valve spring

Valve transmission group parts include ___, _, _, ___, rocker arm assembly etc.

A. camshaft
B. timing transmission
C. tappet
D. push rod

The engine valve train on timeopensor closes the intake valve or exhaust valve according totheoperational need of engine,and itprovides timely admission of the fresh gas mixture (gasoline engine) or air (diesel engine) charge into the cylinders and exhaust of spent gases from them.

A. 对
B. 错