某跨度为8m、强度为C30的现浇混凝土梁，当混凝土强度至少达到（）时方可拆底模。

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某跨度为8m、强度为C30的现浇混凝土梁，当混凝土强度至少达到（）时方可拆底模。
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B.30N/C:UsersAdministratorDesktop\\u56fe片1.png
C.22.5N/C:UsersAdministratorDesktop\\u56fe片1.png
D.21N/C:UsersAdministratorDesktop\\u56fe片1.png

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