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【单选题】
梁腹板高度hw≥( )mm时,中配置纵向构造筋。A.
400
B.
450
C.
500
D.
550
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【单选题】It can be inferred from the passage that in the early 1800's children were generally regarded by their families as individuals who______.
A.
needed enormous amounts of security and affection
B.
required constant supervision while working
C.
were important to the economic well-being of a family
D.
were financial burdens assumed for the good of society
【单选题】听力原文： One important thing about art movements is that their popularity can be affected by social conditions, which are themselves often affected by historical events. As an example, look at what happe...
A.
How historical events affected an art movement.
B.
How artists can influence economic conditions.
C.
Why a certain art movement failed to become popular.
D.
How valuable paintings were lost during wartime.
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