单选题:蒸发量大于0.2t/h的锅炉,锅炉上必须安装(  )彼此独立的水位计,以保证正确地指指示锅炉水位的高低。

题目内容:
蒸发量大于0.2t/h的锅炉,锅炉上必须安装(  )彼此独立的水位计,以保证正确地指指示锅炉水位的高低。 A.1个
B.2个
C.3个
D.4个

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答案解析:

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