（）of the following items is not in the charge of Chief Officer in repairing operation.<br>A:hull cleaning<br>B:derusting and painting<br>C:the maintenance of boiler<br>D:docking and undocking

（）of the following items is not in the charge of Chief Officer in repairing operation.
A:hull cleaning
B:derusting and painting
C:the maintenance of boiler
D:docking and undocking

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