A life preserver or buoyant work vest is required to be worn on a ship when a person is （）.<br>A:working on the rig floor<br>B:working over water<br>C:working on the pipe racks<br>D:operating line throwing equipment

A life preserver or buoyant work vest is required to be worn on a ship when a person is （）.
A:working on the rig floor
B:working over water
C:working on the pipe racks
D:operating line throwing equipment

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