图5为单相桥式整流滤波电路,u i 为正弦电压,其有效值为U i =20V,f=50Hz。若实际测得其输出电压为28.28V,这是由于( )的结果
A.
C开路
B.
C的容量过小
C.
C的容量过大
D.
R L 开路
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举一反三
【简答题】Complete the following sentences with the verbs in the present perfect continuous tense. 用动词的现在完成进行时完成下列句子。 I am tired because I ________ this article all day. (write)
【简答题】Complete the following sentences with the verbs in the present perfect continuous tense. 用动词的现在完成进行时完成下列句子。 Since this morning, the woman ________ alone in her bedroom. (sit)