永磁同步电机有自身的缺点,转子上的永磁材料在( )、( )和( )的条件下会产生磁性衰退的现象。
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永磁同步电机不论定子旋转磁极与永磁铁磁极起始相对位置如何,定子的旋转磁极总会由于磁力拖着转子同步旋转。
A. 对
B. 错
Fill in the blanks with the information of Chapter 6: 6.3 Borrowing 借词法请根据单词来源分类.champagne; ballet; barbecue; hamburger; wokWord Borrowed from French: ___1___Word Borrowed from Chinese: ___2___Word Borrowed from Italian: ___3___Word Borrowed from German: ___4___Word Borrowed from Spanish: ___5___
Fill in the blanks with the information of Chapter 6: 6.5 Acronymy and Initialism首字母缩略法照样子填空:(每空一词)POB: place of birthCEO: ____1________2_______3____BBC: ____4________5________6____
某企业有设备一台,原值19000元,预计净残值率为4%,预计使用10年,计算该固定资产的年折旧率、年折旧额