The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days._精华吧

The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days.

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The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days.

A.7

B.27

C.28

D.30

正确答案：28

Tag：材料概论时间：2022-01-18 21:17:39

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