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【单选题】
如图所示板搁置在截面为250mm×500mm的,轴线都是中心线,本工程为三级抗震,板为C30混凝土,板上部受力钢筋锚入支座平直段长度为0.4Lab,Lab=29d,板钢筋保护层为15mm。板厚100mm,根数四舍五入,本工程4号钢筋的根数为()根。A.
27
B.
28
C.
29
D.
30
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A.
wherever
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whenever
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A.
has an absolute advantage in the activity.
B.
can perform the activity at a lower opportunity cost than can anyone else.
C.
can do the activity in less time than anyone else.
D.
can do everything better than anyone else.
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A.
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B.
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