The signal travels directly to the vertical deflection plates of the Cathode Ray Tube (CRT).
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Voltage applied to these deflection plates causes a glowing dot to less.
A. 对
B. 错
A positive voltage causes the dot to move down while a negative voltage causes the dot to move up.
A. 对
B. 错
二烯烃的官能团与下列哪种化合物的官能团相同( )
A. 烷烃
B. 烯烃
C. 炔烃
D. 二氧化碳
共轭效应的结果是( )
A. 键长差异化
B. 体系能量降低
C. 体系能量增加
D. 稳定性降低