某单层食堂(刚性方案Ho=H),外纵墙承重且每3.3m开一个1500mm宽窗洞,墙高H=5.5m,墙厚240mm,砂浆采用M2.5。外纵墙的高厚比 () 。([β]=22)
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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