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在2007年高考全国理科综合试卷Ⅰ中,第22题如下:实验题:(1)用示波器观察频率为900 Hz 的正弦电压信号.把该信号接入示波器 Y 输入.①当屏幕上出现如图1所示的波形时,应调节__钮.如果正弦波的正负半周均超出了屏幕的范围,应调节____钮或__钮,或这两个钮配合使用,以使正弦波的整个波形出现在屏幕内.
In the 2007 national college entrance examination comprehensive examination paper I, the 22 questions are as follows: Experiment questions: (1) Observe the sinusoidal voltage signal with a frequency of 900 Hz with an oscilloscope. Connect this signal to the oscilloscope Y input. 1 When the screen appears The waveforms shown in 1 should be adjusted with the __ button. If the sine wave’s positive and negative half-periods exceed the range of the screen, adjust the ____ button or the __ button, or use these two buttons together to make the sine wave The entire waveform appears on the screen.