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10秒装修报价 装修要花多少钱?获得精准报价,省钱30%
168211
元
材料费:77201元
人工费:86544元
设计费:1760元
质检费:2706元
价格在50元左右,金属膜精密电阻它是采用高温真空镀膜技术将镍铬或类似的合金紧密附在瓷棒表面形成皮膜,经过切割调试阻值,以达到最终要求的精密阻值,然后加适当接头切割,并在其表面涂上环氧树脂密封保护而成的。由于它是引线式电阻,方便手工安装及维修,用在大部分家电、通讯、仪器仪表上。
碳质电阻器的温度系数很差。所以当温度变化时要求阻值几乎不变的精密应用场合,不适合选用这种电阻器,但它们的价格很便宜。金属膜电阻器适合用于要求高初始精度、低温度系数和低噪声的精密应用场合。我们买了一盘 500个才 就 二 十多块,你说呢?