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数字频率计是一种用来测试周期性变化信号工作频率的装置。其原理是在规定的单位时间（闸门时间）内

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 64,  0,148,  0,  0, 76,192,  7,  4, 64,  1,  4,  0,  0,  4,192, 19,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,240,  0,  0,  0,  0,  0,  0,  0,  0,  0,217,
160,  1,146,  0,  0,  2, 32,  0, 26, 32, 33, 26,  0,  0, 26,128,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 96,  1,  0,  0,  0,  0,  0,  0,  0,128,155,
160,  1, 18,  0,  0,186, 32,  4, 26, 32,  0, 26,  0,  0, 26,128, 67,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,224,  0,  0,  0,  0,  0,  0,  0,  0,128,208,
130,  1,  0,  0,  0, 24,  2,  9, 24,  0,  1, 24,  0,  0, 24,128,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 96,  0,  0,  0,  0,  0,  0,  0,  0,136,137,
192,  1, 72,  0,  0,  8,128,  2, 24,128,  4, 28,  0,  0, 28,128,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,192,  1,  0,  0,  0,  0,  0,  0,  0,128,217,
  0,  0,  1,  2,  0, 64,  0, 32,  0,  4,  0,  0,  0,  0, 32,128,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  2,  0,  0,  0,  0,  0,  0,  0,  0,142,
 96,  2,  6,  0,  0, 26,160,  1,  6, 32,  6, 38,  8,  0,  6,224,  1,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,152,  0,  0,  0,  0,  0,  0,  0,  0,  0,185,
 32,  0,128,  0,  0,  2, 32,  1,  2,160,  5,  2,  0,  0,  2,128,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,104,  1,  0,  0,  0,  0,  0,  0,  0,128,253,
 66,  0,  4,  0,  0,156,192,  7,  4, 64,  2,  4,  0,  0,  4, 64, 18,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,240,  0,  0,  0,  0,  0,  0,  0,  0,  8,189,
160,  1,  0,  0,  0, 66, 32,  4, 26, 32, 33, 26,  0,  0, 26,128,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,104,  0,  0,  0,  0,  0,  0,  0,  0,128,163,
160,  1, 88,  0,  0, 42, 32,  2, 26, 32,  1, 26,  0,  0, 26,128, 67,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,136,  1,  0,  0,  0,  0,  0,  0,  0,  0,181,