The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.<br>A:air compressor<br>B:refrigeration compressor<br>C:vacuum pump<br>D:purifier

The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.
A:air compressor
B:refrigeration compressor
C:vacuum pump
D:purifier

出自：海船船员证

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