The results show that under the same supporting load, the cost of the steel reinforced and tubular concretes decreases as their concrete strength grade increases.
分析结果表明：在支撑相同荷载的前提下，混凝土强度越高，造价越低。
The results show that under the same supporting load, the cost of the steel reinforced and tubular concretes decreases as their concrete strength grade increases.
分析结果表明：在支撑相同荷载的前提下，混凝土强度越高，造价越低。
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