1057. Adjust the potentiometer until you do not hear a hum from the louderspeaker( )

　If there is hum from the loudspeaker,don＇t adjust the potentiometer.

　Adjust the potentiometer unless hear a hun from the loudspeaker.

　Adjust the potentiometer until the loudspeaker no longer hums.

正确答案：C

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3243. The flight compartment gets conditioned air from the left pack and the mix manifold( )

3242. 如果未得到工作授权,不要执行该发动机测试。 ( )

3241. 涂三层底漆 ( )

3240. 作动器的行程被操作面的行程限制 ( )

3239. 拆下四个螺栓中的一个。 ( )

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3236. Production supervisor shall do the designated task in accordance with job cards( )

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3234. Notes call attention to methods which make the job easier, or provide supplementary or explanatory information ( )