永磁同步电机与普通直流电机和异步电机相比,它有()优点。
A. 功率密度大
B. 转矩、转动惯量小
C. 运行效率高
D. 转轴上无滑环和电刷
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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。
A. 高温
B. 震动
C. 过流
D. 过压
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____