单选题The master got permission to pump out 500 tons of clean sea water for （）.Athe purpose of trimmingBthe approval for ballastCthe purpose of voyageDthe approval for operation
单选题
The master got permission to pump out 500 tons of clean sea water for （）.
A
the purpose of trimming
B
the approval for ballast
C
the purpose of voyage
D
the approval for operation
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