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【单选题】
单相半波整流电路的交流电源电压有效值为U2，则输出电压的平均值是（）。A.
0.45U2
B.
0.9U2
C.
U2
D.
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A.
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A.
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B.
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D.
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【单选题】— It is said that Zhang Jiajie City will hold the next Winter Olympics . — Really ,_____ .
A.
Good job !
B.
It’ s up to you !
C.
Congratulations !
D.
I’ m glad to hear that .
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