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另外是靠考查其在类似工作中的应用实绩。在选择国外进口产品要注意：我国是采用220v高内阻电网制式，而欧美地区是110v低内阻电网。由于我国电网内阻大，零点电位漂移大，地电位变化大；工业企业现场的电磁干扰至少要比欧美地区高4倍以上
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