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单选题
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
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考题
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Wear asbestos glovesD
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sludgeC
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考题
单选题It is necessary to remove （） from the cooling water spaces to improve heat transfer.A
limeB
frostC
scaleD
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考题
单选题Acid solution（） in the system can be tested from time to time by putting some on to a piece of lime.A
strengthB
denseC
percentageD
velocity
考题
单选题When oil is accidentally discharged into the water，what should you do after reporting the discharge（）.A
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Throw chemical agents on the water to disperse the oilC
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attempt to isolate the fire from the LPGB
cool the bottles or remove them from the fire areaC
see that the valves on all LPG bottles are closedD
place insulating material over the bottles
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