The unloading system on an air compressor will （）.<br>A:increase compressor discharge pressure on demand<br>B:increase compressor operating speed as necessary<br>C:allow the motor to turn the compressor opposed only by friction<br>D:reduce the compressor frictional load when starting

The unloading system on an air compressor will （）.
A:increase compressor discharge pressure on demand
B:increase compressor operating speed as necessary
C:allow the motor to turn the compressor opposed only by friction
D:reduce the compressor frictional load when starting

出自：海船船员证

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