题目内容

龙门吊车的横梁通常是采取的方式来提高其承载能力。（A）将支座向内移；（B）适当布置载荷（C）合理设计截面；（D）用变截面梁

A. 将支座向内移
B. 适当布置载荷
C. 合理设计截面
D. 用变截面梁

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梁在平面弯曲时，其截面上的最大拉、压应力绝对值是不相等的。

A. 圆形截面
B. 矩形截面
C. T字形截面
D. 热轧工字钢

合理布置支座的位置可以减少梁内的最大弯矩，因而达到提高梁的强度和刚度的目的。（）

A. 对
B. 错

How Can a Parent Help?Mothers and fathers can do a lot to ensure a safe landing in early adulthood for their kids. Even if a job’s starting salary seems too small to satisfy an emerging adult’s need for rapid content, the transition from school to work can be less of a setback if the start-up adult is ready for the move. Here are a few measures, drawn from my bookReady or Not, Here Life Comes, that parents can take to prevent what I call “work-life unreadiness.”

1. → A →2. → E →3. → 4. →5.