题目内容

示波器上横轴代表（），纵轴代表（）

A. 时间，幅值
B. 频率，幅值
C. 速度，电压
D. 电流，速度

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调节垂直标度旋钮，可以改变栅格（）向代表大小，既可以改变波形的（）

A. 横，宽窄
B. 横，高矮
C. 纵，高矮
D. 纵，宽窄

调节时基旋钮，改变栅格（）方向大小，既可以改变波形的（）

A. 水平，宽窄
B. 纵，宽窄
C. 水平，电压
D. 纵，电流

出发调整旋钮的作用是

A. 调整波形不失真
B. 调整波形频率
C. 调整波形停在屏幕上
D. 调整波形大小

Complete the summary of Text A by filling the blanks with the help of initial letter given.A child's clutter awaits an adult's returnThe daughter is leaving home for independence and the mother feels glad on the one hand and expresses her 1. c_____ on the other. The daughter leaves a 2. m in her rooms and the mother 3. s_ up the rooms. After the mother finds a large 4. e with all the memorable things the parents gave to the daughter, the mother's attitude 5. r_____ es completely.