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单选题

(6.2)梁的剪力图如( )所示(5分)

单选题

(7.1)计算C 截面的弯矩为( )(3分)

  • MC=6kN∙m(上侧受拉)

  • MC=9kN∙m(上侧受拉)

  • MC=3kN∙m(上侧受拉)

  • MC=12kN∙m(上侧受拉)

单选题

(7.2)计算截面对中性轴的惯性矩,Iz=( )(3分)

  • 58.32x106(mm4)

  • 58.32x106(mm2)

  • 28.64x106(mm4)

  • 28.64x106(mm2)

单选题

(7.3)计算C 截面上K 点的正应力,σk =( )(4分)

  • 6.17MPa(拉应力)

  • 3.09MPa(拉应力)

  • 5.35MPa(拉应力)

  • 4.25MPa(拉应力)

单选题

(8.1)梁的最大弯矩值为( )(3分)

  • Mmax=72kN∙m

  • Mmax=24kN∙m

  • Mmax=36kN∙m

  • Mmax=160kN∙m

单选题

(8.2)抗弯截面系数Wz=( )(3分)

  • 5.12x105(mm3)

  • 3.0722x106(mm3)

  • 5.12x106(mm4)

  • 6.12x105(mm3)

单选题

(8.3)最大正应力σmax=( )(3分)

  • 140.625MPa

  • 70.31MPa

  • 281.25MPa

  • 100.25MPa

单选题

(8.4)将梁的最大正应力与许用应力比较,可知( )(1分)

  • 杆件满足正应力强度条件

  • 杆件不满足正应力强度条件

单选题

What is the main idea of this article ?________

  • It’s smart to eat foods with low calories and fat content.

  • You can eat well in fast-food restaurant

  • Fast food is always bad for you .

  • Fast-food restaurants are the best the place to find healthy foods .

单选题

A small hamburger and small firies has __________

  • more calories and fat than a chicken sandwich and a salad.

  • fewer calories and fat than a chicken sandwich and a salad.

  • the same amount of calories and fat as a chicken sandwich and a salad.

  • the same amount of calories and fat as a large portion of fries.