反比例函数y=kx的图象在第一象限的分支上有一点A(3,4),P为x轴正半轴上的

题型:解答题

问题:

反比例函数y=
k
x
的图象在第一象限的分支上有一点A(3,4),P为x轴正半轴上的一个动点,
(1)求反比例函数解析式.
(2)当P在什么位置时,△OPA为直角三角形,求出此时P点的坐标.
考点:函数解析式的求解及其常用方法用数量积判断两个向量的垂直关系
题型:解答题

Have you ever wanted to stop eating something sweet but you just couldn’t ? Is the first thing you do when you get home from school to look in the biscuit tin ? Can you eat a huge bar of chocolate all by yourself ? Can you say “no” to sweets at parties ? If you can’t ,  then there is a reason…perhaps you’re sugar addict (有瘾的人)! Does that sound funny ? Well, doctors say that people who eat sweets regularly can easily become addicted (成瘾的) to sugar .What’s more, most sugar addicts don’t even realize that they’re addicted! Sugar addiction is serious because it can really damage your health .Doctors say that we should eat food which is healthy such as fresh fruits and vegetables, and that we shouldn’t eat a lot of sugar ,fat or fast food .But sugar addicts can’t follow this advice.They know they must stop eating sweet food, but they can’t .So what can you do if you think you’re addicted to the taste of sugar ?Well, here is some advice:

Eat some fresh fruits when you really want something sweet to eat .

Cut down on sweet food slowly. Don’t try to stop eating it all at once.

You have to tell your parents, If they know, they will help you.

小题1:Who can become addicted to sugar easily?

A.People who eat sweet regularly.

B.People who eat lots of fat and fast food.

C.People who don’t have a balanced diet.

D.People who eat lots of fruits and vegetables.小题2:What does the underlined word “damage” mean?

A.be kind to

B.be good for

C.be harmful to

D.be sorry for小题3:What can we infer (推断) from the passage?

A.Fresh fruits are the best food for us.

B.We shouldn’t eat sugar to keep healthy.

C.Parents may help you give up bad eating habits.

D.It’s very necessary to stop eating sweet food at once.小题4:What’s the main idea of the passage ?

A.Some advice to stop eating sweet food.

B.The importance of have good eating habits.

C.The reasons why people become addicted to sugar.

D.Something about sugar addiction and how to give it up.

题型:解答题

玉米是我国的主要粮食作物之一,其食用部分主要来自玉米粒的______(选“子叶”、“胚乳”、“胚芽”);测定玉米的发芽率时,需要给玉米提供适量的水分、充足的空气和______.

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奥斯特实验说明了(   )
A.电流也能产生磁场

B.磁场具有方向性

C.磁体间有相互作用

D.以上说法都不正确

题型:解答题

某行1月31日签发银行汇票壹份,其到期日为()。

A、2月28日

B、3月1日

C、3月2日

D、3月3日

题型:解答题

什么是急性龋?()

A、短期内因某些原因多个牙龋坏

B、在菌斑作用下多个牙龋坏

C、在菌斑作用下个别牙龋坏

D、口腔卫生差引起的个别牙龋坏

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