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信号无效标
signal not-in-use sign
信号标志牌
signal marker
区间信号标志牌
section signal marker
反向容许信号标志牌
reverse direction permissive signal marker
复示信号标志
repeating signal marker
标准时间信号发射
standard-time signal emission
标准码实验信号
Standard Code Test Signal
标准输人信号电平
standard input-signal electric level
标准输人信号频率
standard input-signal frequency
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