... protective relay 保护继电器 protective resistor 保护电阻器 protective source housing 辐射源保护罩 ...
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protective shunt resistor 保护性分路电阻
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The surface of resistor is covered with Protective coating which hard to fade, and the surface of coating should avoid unevenness.
电阻器表面二次玻璃体保护膜覆盖完好且难以脱落,表面平整。
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