Historically, expensive voltage varying equipment such as multiple tap transformers or saturable reactors were recommended for all but the very low temperature applications.

 
  • 该产品的电阻值在其有效使用期限内;阻值是逐渐变大.;因此;某种程度上来讲;保持管内输入功率能量或者是熔炉的温度足够高是必须的
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