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【单选题】
为了防止物体通过位于井道上方的开口,包括通过电缆用的开坠落的危险,必须采用圈框,此圈框应山出楼板或完工地面至少()mm。A.
30
B.
50
C.
80
D.
100
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举一反三
【简答题】世界公认的的五大投资金币为,()的鹰洋金币,中国的()金币,()的克鲁格金币,澳大利亚的()金币以及()的枫叶金币
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A.
When
B.
By the time
C.
Until
D.
Ever since
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A.
I miss my daughter a lot.
B.
We haven't seen each other for two months.
C.
About half an hour. I've been looking for her everywhere.
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A.
bought
B.
had
C.
received
D.
borrowed
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A.
died
B.
been died
C.
been dead
D.
death
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A.
joined
B.
taken part in
C.
been
D.
served in
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A.
When
B.
Until
C.
Since
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Before
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