问题
单项选择题
把一弹性块体放入刚性槽内，受均布力q如图所示。已知块体弹性模量为E，泊松比为μ，且立方体与刚性槽之间的摩擦力以及刚性槽的变形可以忽略不计，则立方体上的应力σx为：（）
A.-q
B.（1+μ）q
C.-（1+μ）q
D.-μq
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
把一弹性块体放入刚性槽内，受均布力q如图所示。已知块体弹性模量为E，泊松比为μ，且立方体与刚性槽之间的摩擦力以及刚性槽的变形可以忽略不计，则立方体上的应力σx为：（）
A.-q
B.（1+μ）q
C.-（1+μ）q
D.-μq
参考答案：D
There is no doubt that the friends can improve our lives, kind of friend someone has. There are some good reasons why real are important. Real fiends can be a source(资源) of _ .When you are in trouble， for example， true friends will hope. Real fiends may help a friend to be as a student president，and the president of a country. Some of us will remember that school，work and life are better and more fun when with fiends. And there are other reasons why real friends are . You can quickly real and good fiends when you are down or when you need their help the most. Why? Because a real fiend will not you when you are down，and will not turn against you in jealousy(妒忌)，for example，when you succeed.
|