发布时间:2025-02-05 17:09:17
如果是PTC启动器可用万用表的电阻档R×1欧档进行测量,测量M、S孔应有十几欧至二十几欧的阻值,若发现阻值无穷大,则说明已损坏;如果是重锤启动器同样用万用表的电阻档R×1欧档进行测量,将启动器垂直放置,线圈处于下方,红、黑表笔插入启动器M、S孔,此时应呈断开状态,然后将启动器倒转,线圈垂直处于上方,此时应呈闭合相通,若
2019全球城市竞争力中国城市排行榜2019年全球城市经济竞争力20强
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