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【单选题】
以下关于迫零均衡器的描述正确的是 。A.
迫零均衡器的物理意义是迫使均衡器输出波形仅在抽样时刻取值为 1 ，其他时刻取值为零；
B.
迫零均衡器的物理意义是迫使均衡器输出波形仅在零时刻取值为 1 ，其他抽样时刻取值为零。
C.
迫零均衡器的物理意义是迫使均衡器输入波形仅在零时刻取值为 1 ，其他抽样时刻取值为零。
D.
迫零均衡器的物理意义是迫使均衡器输入波形仅在 抽样时刻取值为 1 ，其他时刻取值为零。
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