The piston rings if found worn out （） and supplied by shipchandler.<br>A:must replace<br>B:must to be equipped<br>C:has to be repaired<br>D:have to be renewed

The piston rings if found worn out （） and supplied by shipchandler.
A:must replace
B:must to be equipped
C:has to be repaired
D:have to be renewed

出自：海船船员证

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