程控电话交换机 Digital Telephone Switch Board ; SPC telephone exchange ; NEC ; program-controlled telephone exchanger 半自动电话交换机 automanualtelephoneswitchboard ; semi-automatic telephone switch board ; automatic telephone switch boa...
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PTC element as over-current limiter for program-controlled telephone exchanger is one of the important application of PTC ceramic material.
程控电话交换机过电流保护元件要求用低电阻率高性能的PTC陶瓷材料来制备。
High performance PTC ceramic material with low resistivity is desired to prepare an over-current limiter for program-controlled telephone exchanger.
程控电话交换机过电流保护元件要求用低电阻率高性能的PT C陶瓷材料来制备。
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