如图甲所示为示波管的构造示意图答案是D,为什么啊啊啊
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![如图甲所示为示波管的构造示意图答案是D,为什么啊啊啊](/uploads/image/z/14127345-9-5.jpg?t=%E5%A6%82%E5%9B%BE%E7%94%B2%E6%89%80%E7%A4%BA%E4%B8%BA%E7%A4%BA%E6%B3%A2%E7%AE%A1%E7%9A%84%E6%9E%84%E9%80%A0%E7%A4%BA%E6%84%8F%E5%9B%BE%E7%AD%94%E6%A1%88%E6%98%AFD%2C%E4%B8%BA%E4%BB%80%E4%B9%88%E5%95%8A%E5%95%8A%E5%95%8A)
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