对钢筋混凝土梁斜截面抗剪承载力计算的位置是下列中哪几个截面?Ⅰ.支座边缘处的截面Ⅱ.受拉区弯起钢筋弯起点处的截面Ⅲ.箍筋截面面积或间距改变处的截面Ⅳ.腹板宽度改变处的截面()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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