关于蒸汽透平一级后压力升高的原因，下列说法不正确的是（）。A

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问题单项选择题

关于蒸汽透平一级后压力升高的原因，下列说法不正确的是（）。

A、叶片、喷嘴结垢

B、抽汽压力增大

C、抽汽阀全开，进汽量太多

D、透平排汽压力降低

答案

参考答案：D

单项选择题

In accrual accounting, the matching principle states that:（）

A. expenses incurred to generate revenue are recognized in the same time period as the revenue.

B. an entity should recognize revenues only when received and expenses only when they are paid.

C. transactions and events producing cash flows are allocated only to time periods in which the cash flows occur.

判断题

采煤机上必须装有能停止工作面运输机运行的闭锁装置。（）