An air compressor can be unloaded at start-up by （）.<br>A:holding the discharge valve open<br>B:relieving the intercooler pressure to the atmosphere<br>C:using an enlarged, permanently opened clearance expansion space<br>D:a pre-charged accumulator

An air compressor can be unloaded at start-up by （）.
A:holding the discharge valve open
B:relieving the intercooler pressure to the atmosphere
C:using an enlarged, permanently opened clearance expansion space
D:a pre-charged accumulator

出自：海船船员证

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