When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.<br>A:strength<br>B:dense<br>C:percentage<br>D:velocity

When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.
A:strength
B:dense
C:percentage
D:velocity

出自：海船船员证

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