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【单选题】_______concrete is used only for footings and concrete slabs laid on the ground, and for other massive structures.

Aforced

Breinforced

Csteel

DPlain

正确答案:A (备注:此答案有误)

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  • 多选题

    选题_______concrete is used only for footings and concrete slabs laid on the ground, and for other massive structures.

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