问题
填空题
示波器上观察到的波形是由加速极电压完成的。( )
答案
参考答案:B
示波器上观察到的波形是由加速极电压完成的。( )
参考答案:B
阅读下面一组“失物招领”广告,回答下列问题。(每格所填词数不限) | |||||||||
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