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【单选题】
一台使用多年的250kW电动机拖动鼓风机,经变频改造运行2个月后常出现跳闸原因可能是()A.
变频器选配不当
B.
变频器参数设置不当
C.
变频供电的高频谐波使电动机绝缘加速老化
D.
负载有时过重
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【简答题】现在许多大公司都利用网站来推销他们的产品和服务。
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A.
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