首页 / 百科 / 内容详情 The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days. 2022-04-30 32次阅读 megapascals generally expressed The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days. A.7B.27C.28D.30正确答案：28 （）strength may be defined as the measured maximum resistance of a concrete or mortar specimen to axial loading. One of the most important properties of molten glass is（）, which changes dramatically as the temperature changes. 猜你喜欢