【单选题】【消耗次数：1】
在纯剪应力状态中，任意两相互垂直截面上的剪应力，必定是（）
①
均为正值
②
均为负值
③
一正一负
④
均为零
参考答案：
复制
纠错
相关题目
【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）
【单选题】
关于下列结论：?1）同一截面上正应力???与切应力???必相互垂直。?2）同一截面上各点的正应力???必定大小相等，方向相同。?3）同一截面上各点的切应力???必相互平行。现有四种答案，正确答案是（???）
①
?1）
②
?1）、?3）
③
?2）、?3）
④
?1）、?2）
随机题目
【单选题】
The boy lost his ____when he stepped on the icy road.
①
way
②
weight
③
balance
④
direction
【单选题】
Never in my life ____ or seen such a thing.
①
I have heard of
②
I had heard of
③
have I heard of
④
did I hear of
【单选题】
—I’m sorry to keep you waiting. —Oh, not at all. I___ here only a few minutes.
①
have been
②
had been
③
was
④
will be
【单选题】
The bus is late and Julie is cold. She____ for the bus for 10 minutes.
①
waits
②
waited
③
has been waiting
④
has waited
【单选题】
Put it down, Richard. You mustnt read ____ letter.
①
anyones elses
②
anyones else
③
anyone elses
④
anyone else
【单选题】
____ the English examination, I would have gone to the concert last Sunday.
①
In spite of
②
But for
③
Because of
④
As for
【单选题】
Every society has its own peculiar customs and____ of acting.
①
attitudes
②
behavior
③
ways
④
means
【单选题】
“She is from Shanghai, ____ population is larger than that of any other city inChina.”
①
its
②
which
③
whose
④
that
【单选题】
Mary: How do you like Professor White’s lecture? John: ____
①
He talked about economy.
②
He teaches Class 2 students.
③
Very much.
④
He is a middle-aged professor.
【单选题】
I will give this dictionary to ____ wants to have it.
①
whomever
②
someone
③
whoever
④
anyone