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【单选题】
关于钢筋混凝土结构楼板、次梁与主梁上层钢筋交叉处钢筋安装的通常做法，正确的是（）。A.
板的钢筋在下、次梁钢筋居中、主梁钢筋在上
B.
板的钢筋在上、次梁钢筋居中、主梁钢筋在下
C.
板的钢筋居中、次梁钢筋在下、主梁钢筋在上
D.
板的钢筋在下、次梁钢筋在上、主梁钢筋居中
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【简答题】晶体在不同晶向上的性能是 ,这就是单晶体的 现象。
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A.
saw
B.
have seen
C.
had seen
D.
to see
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A.
that
B.
what
C.
why
D.
how
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