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The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days.
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
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材料概论
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（）strength may be defined as the measured maximum resistance of a concrete or mortar specimen to axial loading.
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Which of the following does not belong to concrete durability.（）