Limit switches on gravity davits should be tested by（）.<br>A:the engineers，from a panel in the engine room<br>B:shutting off the current to the winch<br>C:pushing the switch lever arm while the winch is running<br>D:All of the above

Limit switches on gravity davits should be tested by（）.
A:the engineers，from a panel in the engine room
B:shutting off the current to the winch
C:pushing the switch lever arm while the winch is running
D:All of the above

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