BNC公头中心连接体为镀金材料，并且BNC母头为镀金铍铜，具有可靠的电气连接性能。
BNC (male) center contact is gold plated and the BNC (Female) is gold plated Beryllium Copper for reliable electrical connection.
镀c材料的微动接触电阻值远高于镀金材料的电阻值，低接触压力下镀c材料的微动接触电阻不稳定。
Contact resistance of carbon-plated material is much higher than that of gold plated materials. Low contact force will result in unstable resistance of C-plated material.
新材料如镀金的铜和银线程出现。
New materials such as gilded cobber and silvery threads emerged.
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