题目内容

甚高频通信控制板上频率选择旋钮，按下旋钮增量为_，拉出旋钮增量为_。

A. 20KHZ、50KHZ
B. 50KHZ、20KHZ
C. 50KHZ、25KHZ
D. 25KHZ、50KHZ

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