Permission is requested to pump out about 200 tons of clean sea ballast water for （） purposes．<br>A:safe manning<br>B:trimming<br>C:avoiding collision<br>D:preventing pollution

Permission is requested to pump out about 200 tons of clean sea ballast water for （） purposes．
A:safe manning
B:trimming
C:avoiding collision
D:preventing pollution

出自：海船船员证

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