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单选题
1057. Adjust the potentiometer until you do not hear a hum from the louderspeaker
A
If there is hum from the loudspeaker,don＇t adjust the potentiometer.
B
Adjust the potentiometer unless hear a hun from the loudspeaker.
C
Adjust the potentiometer until the loudspeaker no longer hums.
答案解析
正确答案：C
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