试题与答案

有两个正弦量,其瞬时值的表达式分别为u=220sin(ωt-10°)V,i=5sin

题型:单项选择题

题目:

有两个正弦量,其瞬时值的表达式分别为u=220sin(ωt-10°)V,i=5sin(ωt-40°)A。那么()

A.电流滞后电压40°

B.电流滞后电压30°

C.电压滞后电流50°

D.电压滞后电流30°

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:辩证否定是事物自身的否定,即自己否定自己,自己发展自己。化蛹成蝶是蝶对蛹的否定,是事物自身的辩证否定。故ABD项错误。本题选C项。考点:辩证的否定观。点评:对于辩证否定观要从含义、特点...

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