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【单选题】
就是两镜片光学中心高度的差值。A.
几何中心垂直互差
B.
几何中心垂直偏差
C.
光学中心水平互差
D.
光学中心水平偏差
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举一反三
【单选题】It is lucky we booked a room， or we ______nowhere to stay now.A.hadB.had hadS
A.
It is lucky we booked a room， or we ______nowhere to stay now. A.had
B.
had had
C.
would have
D.
would have had
【单选题】We were lucky enough， for no sooner _____ home _____ it rained.
A.
we returned， and
B.
we had returned， when
C.
did we return， when
D.
had we returned， than
【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】If we are lucky, we'll catch is responsible. [ ]
A.
whom
B.
who
C.
whomever
D.
whoever
【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.sn
【单选题】下列各项中,不能作为域名的是
A.
www.aaa.edu.cn
B.
ftp.buaa.edu.cn
C.
www,bit.edu.cn
D.
www.lnu.edu.cn
【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
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