问题
选择题
There are certain ________ when you must interrupt people who are in the middle of doing something.[ ]
A．conditions
B．situations
C．occasions
D．environment
答案
答案：C
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There are certain ________ when you must interrupt people who are in the middle of doing something.[ ]
A．conditions
B．situations
C．occasions
D．environment
答案：C
，右侧梁端弯矩设计值
，上柱底部考虑地震作用组合的轴压力设计值N=3400kN，节点上下层柱反弯点之间的距离Hc=4.65m。箍筋采用HPB300级钢筋(fyv=270N/mm2)。取
。箍筋的混凝土保护层厚度为20mm。