脉冲式电话机发出的脉冲,其断续比要求()A.>1 B.1或 发布时间:2017-05-03 10:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: 脉冲式电话机发出的脉冲,其断续比要求()A.>1B.<1C.=1D.>1或<1均可
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