Preventive maintenance （）.<br>A:should not be carried out during the watches<br>B:can only be carried out in port<br>C:is a kind of maintenances carried out prior to the occurrence<br>D:is a kind of maintenances carried out after the occurrence

Preventive maintenance （）.
A:should not be carried out during the watches
B:can only be carried out in port
C:is a kind of maintenances carried out prior to the occurrence
D:is a kind of maintenances carried out after the occurrence

出自：海船船员证

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