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问题 问答题 简答题

如何测定手腕的转动？人体的转动和头部的转动如何测定？

答案

参考答案：

为了测量手部的转动，需要两个发射器，测量出两个发射器t1、t2的空间坐标，就可以根据三角函数确定转动的角度：

tg（.）=（Yt1.Yt2）/（Xt1.Xt2）

tg（.）=（Zt1.Zt2）/（Yt1.Yt2）

tg（r）=（Xt1.Xt2）/（Zt1.Zt2）

人体的转动和头部的转动可用类似的方法测定。区别在于发射器t1、t2安装的位置不同。

完形填空

第二节（共5小题；每小题2分，满分10分）

根据短文内容，从短文后的选项中选出能填入空白出的最佳选项。选项中有两项多余选项。

Children have gentle minds. To find the best way to teach children to share and care is easy. Kids are naturally attracted to animals.   71   Also we can show them the cow eating grass on a farm.

Making them have a look at the animals that are dying out and rare pictures from newspapers is another exciting way to make them love animals. The effects of pollution are difficult for them to understand.     72   There are great pictures of animals like cute rabbits and gorillas.

73    Tell them they are our friends, so we can’t hurt them.Take them to the conservation park and show them a monkey or a rare bird. Show them the types of penguins. Teach your children that animals can feel pain but cannot express themselves like us.    74    If you have pets at home, let them accompany your children deal with them well.

One could call an ambulance for injured dogs or nurse a sick animal back to health. Taking a nature walk is liked by kids and also the best way to get along with the family. Kids love to see some newborn dogs and the mother nursing them.     75     .

A．otions are well understood by children and they may have the same feeling.

B．ildren all like small animals, but they don’t consider them as their friends.

C．ach them never to throw stones to hit animals.

D．is can make children know how to care others.E.e could teach them to be kind to ants and show them how they carry food to save for the rainy day.

F.rents should protect the environment first.

G.erefore one could tell them that the environment should be(kept ) clean.
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单项选择题

能引起骨髓造血系统损伤，产生再生障碍性贫血的药物是（）。

A.氯霉素

B.氨苄西林

C.庆大霉素

D.红霉素
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