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单选题

Adjust the potentiometer until you do not hear a hum from the loudspeaker.

AA. If there is hum from the loudspeaker, don‘t adjust the potentiometer.

BB. Adjust the potentiometer unless hear a hum from the loudspeaker.

CC. Adjust the potentiometer until the loudspeaker no longer hums.

正确答案:A (备注:此答案有误)

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