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拍叉簧信号
telecom. flash hook signal; hookswitch flash signal; hook flash signal
"拍叉簧"信号相当于按"R" 键
telecom. switch-hook flashing
拍叉簧信号原指用户拍钩键，使共电式交换机的信号灯闪亮，引起话务员注意，现沿用为电子式话机"R" 键的功能控制信号
telecom. hookswitch flash signal

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