As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to （）.<br>A:draw a one line diagram of the circuitry<br>B:test all fuses and measure the line voltage<br>C:take megger readings<br>D:insulate the apparatus from ground

As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to （）.
A:draw a one line diagram of the circuitry
B:test all fuses and measure the line voltage
C:take megger readings
D:insulate the apparatus from ground

出自：海船船员证

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