【判断题】【消耗次数：1】
约束反力的方向总是和该约束所能阻碍物体的运动方向相同。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
光滑面对物体的约束反力，作用在接触点处，其方向沿接触面的公法线（）。
①
指向受力物体，为压力
②
指向受力物体，为拉力
③
背离受力物体，为拉力
④
背离受力物体，为压力
随机题目
【单选题】
There is_______ coffee in this glass as in that one.
①
five times as many
②
five times as much
③
five times than
④
five times more
【单选题】
--I was quite surprised that I was elected as the chairman of the meeting.--________________________________
①
I think so.
②
You shouldnt surprise.
③
You are welcome.
④
You did an outstanding job and you really deserved it.
【判断题】
Different cultures give different styles of response to compliment(赞美), for example, Chinese people are likely to say Thanks a lot .
①
正确
②
错误
【判断题】
When you ask sb. to open the window, if you are a lady its polite to say Open the window, will you? if you are a man you should say Lets open the window, shall we?
①
正确
②
错误
【判断题】
When you are asked Whats your name?, its more polite to respond with a whole sentence My name is... than only telling a name.
①
正确
②
错误
【判断题】
The question What is your affiliation? is to ask where you are working,you should answer I am with...
①
正确
②
错误
【单选题】
－Hello, may I talk to the headmaster now?－______________
①
Sorry, you can’t.
②
No, you cant.
③
Sorry，he is busy at the moment.
④
I dont think so.
【单选题】
—How long will you be staying?—_________________.
①
On Oct 20th.
②
At Friday.
③
Four days.
④
In a week.