When should the tuning be adjusted?

admin2011-01-13  6

问题
When should the tuning be adjusted?

选项 A、When there is no picture and no sound
B、When there is a picture but no sound
C、When the picture is white
D、When there is noise but no picture

答案D

解析 For no picture and noise, WHAT TO DO suggests adjust tuning. Choice (A) is not mentioned. Choice (B) needs the volume turned up or the earphones disconnected. Choice (C) needs the brightness control adjusted.  
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