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【单选题】
( )为封闭式结构,适用于无天花板且电磁干扰比较严重的环境,但对细统扩充、修改和维护比较困难。A.
梯式桥架
B.
槽式桥架
C.
托盘式桥架
D.
组合式桥架
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反馈参考答案：
举一反三
【单选题】Man: If I don't find my wallet pretty soon, I have to report it stolen. Woman: Hold on! Before you call the campus security office, have you checked your Car, all your jacket pockets everywhere? Quest...
A.
Keep looking for his wallet.
B.
Report the theft of the wallet right away.
C.
Put his wallet in his jacket pocket.
D.
Be more careful with his wallet.
【单选题】—Can you join us in the party this evening? —Well，that depends on _____ I can have my report done before then. [ ]
A.
whether
B.
where
C.
when
D.
how
【单选题】—People say the subway (地铁) building in Harbin in a few years. —Sounds . I have never seen it before. [ ]
A.
will finish, interesting
B.
is finished, interested
C.
will be finished, interesting
D.
will be clean
【单选题】America will never again have as a nation the spirit of adventure as it __________ before the West was settled.
A.
could
B.
did
C.
would
D.
was
【单选题】-I have finished the task . How about you? -We haven’t finished ours .
A.
yet; yet
B.
already; ever
C.
before; already
D.
already; yet
【单选题】—Can’t you stay a little longer? I really want to talk more with you, —Me, too. I have to get home before 10 at night.
A.
But
B.
Since
C.
And
D.
For
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