正确答案: A

20m

题目：某水泵运行时进口压力为0.05MPa，排出口压力为0.25MPa，则水泵的扬程约为( )(设1MPa≈100m水柱高)。

解析：A

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举一反三的答案和解析：

[单选题]废气涡轮机的实际压缩过程是( )。

多变过程

[单选题]All engineer officers and engine room ratings shall be aware of the serious effects of operational or accidental pollution of the marine environment and shall take all possible ____ to prevent such pollution, particularly within the framework of relevant international and port regulations.

precautions

[单选题]二冲程柴油机的换气过程包括的阶段有()

A+B+C

[单选题]_____ shows 1.2 meter and the specific gravity of the oil is 0.96According to the measuring scale, that makes 150 tons.

The sounding rod

[单选题]向机舱内释放二氧化碳时应：

一次性释放完毕