When adding oil to a refrigeration system, precautions must be taken to ensure that （）.<br>A:the compressor suction pressure is not too high<br>B:all air is purged from the pump and charging fittings<br>C:the high pressure cutout switch is held open to prevent accidental starting<br>D:the condenser is completely shutdown first

When adding oil to a refrigeration system, precautions must be taken to ensure that （）.
A:the compressor suction pressure is not too high
B:all air is purged from the pump and charging fittings
C:the high pressure cutout switch is held open to prevent accidental starting
D:the condenser is completely shutdown first

出自：海船船员证

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