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【单选题】
如图所示 ,当只有其中一个开关按下时,蜂鸣器和LED灯会()。A.
蜂鸣器会发声,LED灯会亮
B.
蜂鸣器不会发声,LE.D灯会亮
C.
蜂鸣器会发声,LED灯不会亮
D.
蜂鸣器不会发声,LED灯不会亮
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A.
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B.
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C.
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D.
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A.
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B.
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C.
every four or five pages
D.
every ten or twelve pages
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