当采用底部剪力法计算多遇地震水平地震作用时,特征周期Tg=0.30s,顶部附加水平地震作用标准值ΔFn=δnFEk,当结构基本自振周期T1=1.30s时,顶部附加水平地震作用系数δn应与()最为接近。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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