About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）<br>A:an engine-driven；as well<br>B:an engine-driven；has an independent pump<br>C:an independent；as well<br>D:an independent；has an engine-driven pump

About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）
A:an engine-driven；as well
B:an engine-driven；has an independent pump
C:an independent；as well
D:an independent；has an engine-driven pump

出自：海船船员证

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