【单选题】【消耗次数：1】
2A和3A，则三段杆的横截面上轴力和应力分别（）
①
不等，相等
②
相等，不等
③
相等，相等
④
不等，不等
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【多选题】
横截面面积相等、材料不同的两等截面直杆，承受相同的轴向拉力，则两杆的( )。
①
轴力相同
②
横截面上的正应力也相同
③
轴力不同
④
横截面上的正应力也不同
⑤
线应变相同
【单选题】
已知牛顿环两两相邻条纹间的距离不等．如果要使其相等，以下所采取的措施中不可行的是（）
①
将透镜磨成半圆柱形
②
将透镜磨成圆锥形
③
将透镜磨成三棱柱形
④
将透镜磨成棱柱形
【单选题】
下列结论中哪些是正确的是（）。(1)杆件的某个横截面上，若轴力N为正（既为拉力），則各点的正应力σ也均为正（既均为拉应力）。(2)杆件的某个横截面上，若各点的正应力σ均为正，則轴力N也必为正。(3)杆件的某个横截面上，若轴力N不为零，則各点的正应力σ也均不为零。(4)杆件的某个横截面上，若各点的正应力σ均不为零，則轴力N也必定不为零。
①
（1）、（2）
②
（3）、（4）
③
（1）、（2）、（3）、（4）
随机题目
【单选题】
— What are your great strengths?— .
①
I am very shy
②
My job offers me high income
③
I am very active in discussion
④
Ok
【单选题】
It is believed lifelong learning is a crucial response to the challenge of the global ________ economy.
①
technology
②
knowledge
③
examination
④
response
【单选题】
—Would you like to come to our party this weekend?—______.
①
Yes, it was an interesting party
②
No, I’d like to
③
I’m sorry that I won’t be able to attend the party
④
No
【单选题】
— Why do you think the distance education cannot take place of the formal education?— I take this opinion __________ my experience.
①
because
②
because of
③
since
④
that
【单选题】
Quizzes are part of the lecture program to keep students engaged and keep them _________, for students to be able to check that they understood what was covered.
①
thinking
②
think a lot
③
to think
④
thought
【单选题】
—Did you enjoy your college life?—______.
①
Yes, it was rich and colorful
②
No, it is interesting
③
I like my college very much
④
yes, it is.
【单选题】
The fact ________ that we are behind the other classes.
①
seems to be
②
must be
③
remains
④
take
【单选题】
By _________ learning possible anytime and anywhere, distance education is a powerful tool for supporting lifelong learning.
①
making
②
make
③
made
④
be made
【单选题】
One big of formal education is the high cost.
①
advantage
②
disadvantage
③
problem
④
condition
【单选题】
No more having to buy expensive textbooks which you will only use for a year or two and then sell or _______ away.
①
get
②
give
③
take
④
gain