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單項(xiàng)選擇題

Moisture should be kept out of an R-12 system because it tends to cause （）.

A.icing of the automatic controls
B.embrittlement of some parts of the automatic controls
C.sludge in the lubricating oil
D.all of the above

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單項(xiàng)選擇題
Black smoke coming from a boiler can be caused by （）.
A.low water level
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If a bilge pump failed to build up discharge pressure, you should check for （）.
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