Air compressor cylinder un-loaders enable the compressor to （）.<br>A:vary their speed according to temperature and load<br>B:start and come up to speed before air compression begins<br>C:change speed according to overload demands<br>D:reduce compressed air charge density

Air compressor cylinder un-loaders enable the compressor to （）.
A:vary their speed according to temperature and load
B:start and come up to speed before air compression begins
C:change speed according to overload demands
D:reduce compressed air charge density

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