为保护墙面转角处不易遭碰撞损坏,在室内抹面的门窗洞口及墙角、柱面的阳角处应做水泥砂浆护角,护角高度一般为 ( ) ,每侧宽度不小于50mm。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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