题目内容 (请给出正确答案)
提问人:网友l******8 发布时间:2022年5月1日 08:58
[单项选择题]

示波器在使用时屏幕上没有任何信号可能的原因有()

A、示波器的电源开关没有打开

B、亮度设置太低,请调节亮度旋扭,增加亮度

C、波形偏离屏幕显示区

D、全部都有可能

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