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【单选题】
跨度为6m，混凝土强度为C30的现浇混凝土板，当混凝土强度至少应达到()方可拆除底模。A.
15N/mm2
B.
21N/mm2
C.
22.5N/mm2
D.
30N/mm2
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A.
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A.
positive (支持的)
B.
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A.
可以在光线充足的场所进行;
B.
更易观察到小的迹象;
C.
可用于不应与水接触的场合;
D.
对于缺陷的污染较不敏感;
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【单选题】(2)利用定积分的性质比较 与 大小( )