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

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

未来题库→百科

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

Tags:megapascals generally expressed

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