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【单选题】
图示各结构中，除特殊注明者外，各杆件EI=常数。其中不能直接用力矩分配法计算的结构是（ ）。A.
1 00mm
B.
300mm
C.
400mm
D.
200mm
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【单选题】--- Have you solved your problem? ---I've kept on thinking about that matter ______, but I have no idea yet now.
A.
at times
B.
some time
C.
at a time
D.
all the time
【单选题】Recently some hospitals in China have adopted ______ they call a robot-doctor, ______ will be used to operate on patients with more accuracy.
A.
what; that
B.
that; which
C.
what; which
D.
which; what
【单选题】If I ____ your address, I would have visited you.
A.
know
B.
knew
C.
have known
D.
had known
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