已知直线l1:2x-y+3=0,l2:3x+y-5=0,l3:3x-2y=0的倾

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问题:

已知直线l1:2x-y+3=0,l2
3
x+y-5=0,l3:3x-2y=0的倾斜角分别是α1、α2、α3则α1、α2、α3的大小关系是(  )
A.α1>α2>α3B.α2>α1>α3C.α1>α3>α2D.α3>α1>α
考点:直线的倾斜角与斜率
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Health is the most important thing in the world. Nothing is more important than health. If we take away our money, houses, or even our clothes, we can still survive.___小题1:__    That is why we always try to eat in a healthy way and exercise regularly.

How can we keep healthy? In order to eat healthily, I usually avoid eating food high in fat, like French fries or cookies, which are junk food .小题2:_ I eat a lot of vegetables and fresh fruit which are full of vitamins.

小题3:_ Taking exercise every day helps us build a strong body. Regular exercise is an important part of keeping me healthy.

What’s more, I think friends are an important part of one’s health. _小题4:_I always feel better when I am with friends than I am alone. When I am with friends, I always laugh .Laughing is also an important part of health. It's good to stay with my friends.

By eating properly and exercising regularly, I can keep my mind as well as my body happy. These things sound easy to do, but not many people can manage them. ___小题5:_

A.On the other hand , doing exercise is very important

B.There are some people who like staying alone, but they keep healthy.

C.Many students show that people with a wide range of social contacts don’t get sick

D.But if our health was taken away , it is certain that we would surely dieE. I only eat little meat

F. I think a strong will is necessary if want to keep healthy

G. Some people appear fat because they often eat too much

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一条入射光线与镜面的夹角为60°,反射角是______.若反射角增大15°,反射光线和入射线的夹角是______.入射光线和镜面的夹角是______.若反射光线与镜面垂直,则入射角是______,反射角是______.

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安装工程常用的铸铁种类包括()。

A.灰口铸铁

B.球墨铸铁

C.汕罐铸铁

D.蠕墨铸铁

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绞刀的前角通常是00。

题型:选择题

红细胞直方图显示曲线波峰左移,峰底变窄,提示为()。

A.缺铁性贫血

B.小细胞均一性贫血

C.铁幼粒细胞贫血

D.球形红细胞增多症

E.巨幼细胞贫血

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