某钢筋混凝土粱的跨度为9m．当设计无具体要求时．混凝土强度满足( )时方可拆除底模。

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【单选题】【消耗次数：1】

① ≥50％设计强度

② ≥75％设计强度

③ ≥l00％设计强度

④ 保证混凝土表面及棱角不因拆除而受损坏

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