组合钢模板常用于墙体、梁、柱等现浇钢筋混凝土构筑物的模板工程。()
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含砾和不含砾的黏性土的填筑标准应以压实度和最优含水率作为设计控制指标。()
In the earlier years, most environmental treaties provide for financial resources to be made available to compensate for the additional costs of protective measures.
若 A 的所有 r 阶子式都等于零,则 A 的秩小于 r.