某框架梁柱节点,左右梁端弯矩设计值之和为640KN·m,上下柱的线刚度比值为7:9,不考虑内力调整,则下柱端截面的弯矩设计值为( )KN·m。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧