Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.<br>A:an auxiliary reservoir<br>B:a controlling air bottle<br>C:an emergency air compressor<br>D:a main air compressor

Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.
A:an auxiliary reservoir
B:a controlling air bottle
C:an emergency air compressor
D:a main air compressor

出自：海船船员证

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