The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.<br>A:acid<br>B:alkali<br>C:salt<br>D:None of the above

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

出自：海船船员证

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