单选题Moisture should be kept out of an R-12 system because it tends to cause （）.Aicing of the automatic controlsBembrittlement of some parts of the automatic controlsCsludge in the lubricating oilDall of the above
单选题
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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