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【单选题】砖混结构中构造柱的最小截面尺寸为（），竖向钢筋一般用4φ12，钢箍间距不大于250mm。
A.
180mm×180mm
B.
240mm×180mm
C.
240mm×240mm
D.
500mm×500mm
【单选题】[单选,案例分析题] 某建筑物按抗震要求为乙类建筑，条形基础及地基土的剖面见下图。基础底面以下各土层的厚度、土性指标、标准贯入试验锤击数临界值及液化指数示于下表。按地震作用效应组合计算时，作用于基础顶面的竖向荷载F=500kN。液化地基处理表土层的厚度与计算参数对液化土层进行砂石桩挤密处理，砂石桩的直径取400mm，正方形布桩，要求将其孔隙比从0.90减少到0.75，则砂石桩的间距应最接近于（）...
A.
A.1.30
B.
1.50
C.
1.80
D.
2.00
【多选题】构造柱可以按净断面面积乘以规定的系数，该增大系数表述正确的是( )
A.
接墙侧面数为 1，体积增大系数为 1.125。
B.
接墙侧面数为 2，体积增大系数为 1.375
C.
接墙侧面数为 3，体积增大系数为 1.375
D.
接墙侧面数为 3，体积增大系数为 1.50
E.
接墙侧面数为 2，体积增大系数为 1.50
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves