普通混凝土标准试件经28天标准养护后测得抗压强度为22.6MPa,同时又压得同批混凝土水饱和后得抗压强度为21.5MPa和干燥状态得抗压强度为24.5MPa,该混凝土的软化系数为。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧