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_______N/mm2时,方可拆除底模。
A.15
B.21
C.22.5
D.30
正确答案是C
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Children may go on the trip only with the permission of their parents or ( ). (guard)