Before being used the fuel service tank should be drained of （）.<br>A:soda solution<br>B:mechanical impurities<br>C:ballast<br>D:water and residuals

Before being used the fuel service tank should be drained of （）.
A:soda solution
B:mechanical impurities
C:ballast
D:water and residuals

出自：海船船员证

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