操作完后，关掉电动机。（）<br>A:After operation, start the electric motor.<br>B:Before operation, stop the electric motor.<br>C:Before operation, start the electric motor.<br>D:After operation, stop the electric motor.

操作完后，关掉电动机。（）
A:After operation, start the electric motor.
B:Before operation, stop the electric motor.
C:Before operation, start the electric motor.
D:After operation, stop the electric motor.

出自：船舶水手证

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