【判断题】【消耗次数：1】
在平面机构中一个低副引入两个约束。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
下列命题“如果一个平面经过另一个平面的一条垂线，那么这两个平面互相垂直”，“如果两个平面互相垂直，那么一个平面内的一已知直线必垂直于另一个平面内的任意一条直线”，“过互相垂直的两条直线中的一条所作的平面必垂直于另一条直线”，“分别过两条互相垂直的直线所作的平面必相交”中，错误的命题有（）个。
①
1
②
2
③
3
④
4
随机题目
【单选题】
__________ my love of landscape, nothing could persuade me to spend another day in the Highlands.
①
But for
②
For all
③
Above
④
Except for
【单选题】
Food was in short __________ ; women stood in line for hours for a bucket of drinking water.
①
store
②
provision
③
reserve
④
supply
【单选题】
His parents __________ him the opportunity to go to university.
①
ignored
②
neglected
③
refused
④
denied
【单选题】
Graceland, Elvis Presley’s former home, is now a tourist __________ that draws more than 600,000 visitors every year.
①
store
②
attraction
③
appointment
④
arrangement
【单选题】
Great changes __________ in our institute in the last few years.
①
have taken place
②
has taken place
③
took place
④
had taken place
【单选题】
-- Sorry I kept you waiting.
①
I’m sad
②
I don’t care
③
That’s all right. There’s no hurry
④
No, not at all
【单选题】
You have lovely children.
①
No, no, no. They are not
②
Oh, no, no
③
You’re talking too much
④
Thanks