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【单选题】
自耦变压器二次有2~3组抽头,其电压可以分别为一次电压UI的80%、( )%、40%A.
10
B.
20
C.
60
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】We ______ ; we followed the boss into the hall as his guests. How lucky we were!
A.
didn’t need to wait
B.
needn’t have waited
C.
must have waited
D.
couldn’t have waited
【单选题】We are lucky to be among the generation of people who have ________ and experienced the great social changes in our country.
A.
conflicted
B.
responded
C.
witnessed
D.
associated
【单选题】If we are lucky, we'll catch is responsible. [ ]
A.
whom
B.
who
C.
whomever
D.
whoever
【单选题】—I really hope we can see Zhao Benshan in Beijing this time. —Maybe, if we are____. [ ]
A.
lucky enough
B.
enough lucky
C.
good enough
D.
enough good
【单选题】-- Will the weather be all right for our picnic this weekend? -- No, ______ we are lucky. The newspaper says it’ll be rainy anyway.
A.
if
B.
as
C.
though
D.
unless
【单选题】下列各项中,不能作为域名的是
A.
www.cernet.edu.cn
B.
News.baidu.com
C.
ftp.pku.edu.cn
D.
www,cba.gov.cn
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