【多选题】以下关于允许开裂的部分预应力混凝土受弯构件应力计算的正确说法是( )
A.
预应力钢筋的应变包括有效预应变、消压应变和消压后的应变增量
B.
受压区混凝土边缘压应力从拉应变逐渐增大到压应变
D.
预应力钢筋和普通钢筋的应力均可以使用应变与弹性模量确定
【单选题】砌体砌筑时,不需要()和特殊的施工方法。
【多选题】采用弹性分析法计算允许开裂的部分预应力混凝土受弯构件时( )
【简答题】定义复数类Complex,成员变量有实部real和虚部image,成员方法有: (1)无参构造方法,其中成员变量初始值为0; (2)带2个参数的构造方法,分别给实部虚部赋值; (3)取得/设置实部值; (4)取得/设置虚部值; (5)ToString方法,将复数转成字符串,格式形如:(3,-6i)。
【单选题】—What if we don't follow the traffic lights or the traffic police? —It _______ dangerous. [ ]
【多选题】钢筋混凝土受弯构件的第二工作阶段又可称为开裂后弹性阶段,对于第二工作阶段的计算,一般有下面( )三项基本假定
【单选题】The driver ____at the crossroads as the traffic lights flashed red.
【单选题】What did the man tell the woman?
B.
The traffic lights were red.
【简答题】IX. When you are in England , you must be very careful in the street because the traffic drives on the left. You must look at the right first and then the left, then you can cross the street. If the t...
【简答题】IX. When you are in England , you must be very careful in the street because the traffic drives on the left. You must look at the right first and then the left, then you can cross the street. If the t...