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【简答题】
核酸的基本组成单位是 ,蛋白质的基本组成单位是 。
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皮皮学刷刷变学霸
举一反三
【多选题】关于三相异步电动机的工作原理,说法正确的有
A.
必须有转速差；转速差越大，转子电流就越大，电磁转矩也越大。
B.
转子电流的产生、电能从定子到转子的传递都是基于电磁感应现象，因此异步电动机也称为感应电动机。
C.
转子和旋转磁场不同步，故此电动机称为异步电动机。
D.
电机启动时，转差率s很小（≈0.015～0.060）。
【简答题】A) They were a lot of noise. B) They were looking after the queen. C) They were dancing in a unique way. D) They were looking for a new box to live in.
【简答题】They have four hours' tennis (train) every afternoon.
【单选题】一台转子绕组断路的三相异步电动机，若给其定子绕组通入三相交流电，则（ ）。
A.
电动机会顺利启动
B.
因为 定子中不会产生旋转磁场，所以电动机不能启动
C.
定子中会产生旋转磁场，但 转子导体不会切割磁力线，也不会产生感应电动势
D.
定子绕组 会 产生旋转磁场， 转子导体切割磁力线 会产生感应电动势，但由于转子绕组断路而不会产生感应电流，更不会 产生电磁转矩， 因而电 动机无法启动
【简答题】Task 2: Works in pairs. Discuss with your partner and try to make a list of the basic elements of an L/C. Hints: All L/Cs contain these elements: A payment undertaking given by the bank (issuing bank)...
【简答题】4 A.) They were a lot of noise. B) They were looking after the queen. C) They were dancing in a unique way. D) They were looking for a new box to live in.
【单选题】A) He is a queen been specialist . B) He works at a national park . C) He removed the beyond from the boot . D) He drove the bees away from his car. 4 .
A.
) They were making a lot of noise
B.
) They were looking after the queen
C.
) They were dancing in a unique way
D.
) They were looking for a new box to live in
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