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单选题
Expansion tank should be used to remove （） from cooling water.
A
scale
B
sludge
C
chemicals
D
air
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单选题Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）A
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discharge side of the centrifugal pumpB
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单选题（） allows for expansion and water make up in the water cooling system.A
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airB
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单选题Expansion tank should be used to remove （） from cooling water.A
scaleB
sludgeC
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burned or cracked piston in one cylinder
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单选题Which of the listed statements is correct concerning refrigeration systems?（）A
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单选题It is necessary to remove （） from the cooling water spaces to improve heat transfer.A
limeB
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