【单选题】【消耗次数：1】
预应力砼与普通砼相比，具有以下特点（）。
①
构件断面小，自重轻
②
单价低，经济适用
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相关题目
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砼拌制二次投料与一次投料相比较，砼强度可提高_____%；在砼强度等级相同的情况下，可节约水泥_____%
①
15 /15~20
②
20/20~30
③
10/15~20
④
20/15~30
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a bit;a little
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little;a bit
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food; her
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food;/
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diet; her
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diet;/
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well worth; to buy
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very worth; buying
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worthing , buying
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worthy, to buy
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which; happy
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who; happily
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who; happy
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