Where tanks are arranged for either oil or ballast, （） must be fitted in the pipeline.<br>A:a change-over chest<br>B:a head tank<br>C:a emergency bilge pump<br>D:an air cooler

Where tanks are arranged for either oil or ballast, （） must be fitted in the pipeline.
A:a change-over chest
B:a head tank
C:a emergency bilge pump
D:an air cooler

出自：海船船员证

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