Before switching on gyro-compass，you should make sure that the power supply on board is（）.<br>A:high or low<br>B:AC or DC<br>C:strong or weak<br>D:on or off

Before switching on gyro-compass，you should make sure that the power supply on board is（）.
A:high or low
B:AC or DC
C:strong or weak
D:on or off

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