Moisture should be kept out of an R-12 system because it tends to cause （）.<br>A:icing of the automatic controls<br>B:embrittlement of some parts of the automatic controls<br>C:sludge in the lubricating oil<br>D:all of the above

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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