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【单选题】
以下整流电路功率因数最小的是( )。A.
不控整流电路
B.
桥式整流电路
C.
半控桥式整流电路
D.
无法确定
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【简答题】阅读理解 Lily is from New York , the U.S.A. She is twelve. She is in Shanghai NO.3 Junior High School. She is in Class Eight, Grade One. Her phone number is 66786019. Dongdong is from Kunming. His English...
【单选题】It can be inferred that Phyllis's trip to England with Nathaniel in 1773 ______.
A.
did not improve her health
B.
was for business reasons
C.
led to books of her poems being available in America
D.
led to the publication of her poems because the English were more interested in religious and moral subjects
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