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【单选题】
某现浇混凝土结构，混凝土强度等级为C30，期中跨度为6m的悬挑长度为1.2m的阳台板的底模，应待混凝土强度分别达到（　）时方可拆除。
A.
21N/mm2，22.5N/mm2
B.
30N/mm2，21N/mm2
C.
22.5N/mm2,30N/mm2
D.
30N/mm2,30N/mm2
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