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【多选题】
以下说法正确的是( )。
A.
磁阻式电机在极低频下工作的状态近似于单步运动
B.
电机的失转子前进的步数少于脉冲数
C.
电动机转动时所产生的转矩称为动态转矩，动态转矩就是电机连续运行时的输出转矩
D.
电机的启动必须满足启动转矩大于最大负载转矩，控制频率大于启动频率
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【单选题】要使用已卧放的乙炔瓶,必须先直立后静置多少分钟再用?( )
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【单选题】Isaac Ltd is a company which buys agricultural produce from wholesale suppliers for retail to the general public. It is preparing its financial statements for the year ending 30 September 20X4 and is ...
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查看完整题目与答案
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