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![How to Choose Concrete for a Project: 7 Steps (with Pictures)]()
www.wikihow.comStrength is usually determined by compression testing, and is expressed in Pounds per Square Inch (PSI). Normal concrete mixes range from 2500 PSI to 5000 ...瀏覽：504
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日期：2024-07-10
Strength is usually determined by compression testing, and is expressed in
Pounds per Square Inch (PSI). Normal concrete mixes range from 2500 PSI to
5000 ......
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