题目内容
The general purpose oscilloscope is used in servicing communications, scientific, or industrial work where the frequency of the signal to be observed does not greatly exceed 1000 kHz.
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The signal travels directly to the vertical deflection plates of the Cathode Ray Tube (CRT).
Voltage applied to these deflection plates causes a glowing dot to less.
A positive voltage causes the dot to move down while a negative voltage causes the dot to move up.
二烯烃的官能团与下列哪种化合物的官能团相同（ ）
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