在计算抗震设计的框架节点时,当四边有梁约束,梁宽不小于1/2柱宽,两个方向梁的高度分别为850mm和600mm,其节点约束数的取值为:( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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