When（）clean ballast water from any vessel，an application shall be made to Harbor Authorities for approval.<br>A:discharging<br>B:recircling<br>C:loading<br>D:taking in

When（）clean ballast water from any vessel，an application shall be made to Harbor Authorities for approval.
A:discharging
B:recircling
C:loading
D:taking in

出自：海船船员证

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