单选题Limit switches on gravity davits should be tested by（）.Athe engineers，from a panel in the engine roomBshutting off the current to the winchCpushing the switch lever arm while the winch is runningDAll of the above
单选题
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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