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You should _______________ to one or more weekly magazines such as Time or Newsweek.

— What would you like to have, meat or fish?

— _____________________.

— ___________________

— Once or twice a week.

(单选题)The computer turns it __________ green, yellow, or red lights.(2)
Our success _______ whether everyone works hard or not.( )
Whether we will go or not __________ the weather.
Which ________ do you prefer, coffee or orange juice?
Tables______ of stones or wood.
Do you feel like ________ to a film or would you rather ________ at home.
Without water, _________ no plants or animals.
I am wondering if they are ____ or____.
_________ in a person’s speech or writing usually ranges on a continuum from casual or colloquial to formal or polite according to the type of communicative situation.
__________ is the act performed by or resulting from saying something; it is the consequence of, or the change brought about by the utterance.
定子旋转磁势相对于转子的转速为_______r/min
一台6极三相异步电动机接于50Hz的三相对称电源,其s=005,则此时转子转速为_____r/min,定子旋转磁动势相对于转子的转速为_____r/min,定子旋转磁动势相对于转子旋转磁动势的转速为_____r/min。
当s在_______范围内,三相异步电机运行于电动机状态,此时电磁转矩性质为_______;在_______范围内运行于发电机状态,此时电磁转矩性质为_______。
同步电机转速为750r/min,频率为50Hz,则该电机是_______极的。
拖动磨擦性恒转矩负载运行于正向电动状态的三相异步电动机,对调其定子绕组任意两个出线端后,电动机的运行状态经_____和_____状态,最后稳定运行于_____状态。
电力系统元件一般可分为静止元件和旋转元件。三相异步电动机属于旋转元件,其正序阻抗与负序阻抗______。
三相异步电动机电源电压一定,当负载转矩增加,则转速_______,定子电流_______。
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