以下刚架的弯矩图形式,哪个图正确(设定横梁和立柱的线刚度相等)()
A.A
B.B
C.C
D.D
参考答案:A
解析:
图示刚架立柱有剪力存在,弯矩图为倾斜直线,且存在反弯点。
已知集合U={1,2,3,4,5},A={1,2,3},B={2,5},则A∩CUB= [ ]
A.{2}
B.{2,3}
C.{3}
D.{1,3}
Don’t worry. We have ___________food in the fridge now.
A. much B. many C. little