已知一个宽b=2m,长l=4m和另一个宽b=4m,长l=8m的矩形基础底的附加应力相等,则两基础角点下竖向附加应力之间有何关系?()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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