单项选择题

The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.

A.acid
B.alkali
C.salt
D.None of the above

相关考题

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单项选择题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）

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（） should be tested and adjusted when the boiler survey...

单项选择题（） should be tested and adjusted when the boiler survey is carried out.

A.The boiler oil tank
B.The steam pipe
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船舶辅助机械

The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.