卧位腰椎穿刺的脑脊液压力正常值是：（） A.50～180mmH2O B.80～180

阅读理解。

Dear Editor,

      I am not a good-looking boy and I am not good at studying,either. I often feel lonely. Sometimes I think that if I want to leave home,nobody will care. How can I stop feeling like this?

                                                                                                                                               Peter

Dear Peter,

      But first.I am sure that you are wrong that nobody will care if you leave your home. What about your parens? And other family members? It seems that you are very sad. You'd better go to see a doctor or talk to your parents. They can help you. Second,l'm sure there's someone in your class who feels lonely,too. You never know how other people feel inside. Try to make friends with them. Or you join a club to meet new people and to keep yourself busy.

     You need to find happiness in yourself. Write a list of all the good things about yourself. Learn to like yourself,and then others will see your confidence (信心)and like you,too.

                                                                                                                                               Editor

1. Peter isn't good at            and he feels            .

2. He writes to the editor to ask for            because he wants to      feeling lonely.

3.If Peter joins a club,he can           new people and keep          busy.

4.The editor suggests (建议) that Peter should talk to a           and his           .

5,Peter lacks (缺少)           and he needs to find in himself.

如下图所示，若要使滑动变阻器的滑片P向C端滑动时使小灯泡变亮，那么应将滑动变阻器的接线柱          和           接在电路的M、N两端。

关于海洋资源的叙述，正确的是（     ）

A．海底蕴藏着丰富的石油

B．海洋中蕴藏着大量的食盐、镁、溴等海底矿产资源

C．利用的海洋空间资源包括海上、海中、海底三部分

D．海洋渔业资源主要集中在大陆架海域

冬天手冷时，将双手相互搓擦可使手感到暖和，这是利用_________的方式使手的内能增大的；用热水袋使手暖和，则是用____________方式改变物体的内能的。

免疫反应的特异性是指（）

A.样品测定值与标准品值的符合程度

B.样品测定值与平均值的偏差

C.某一试验方法的最小可测量

D.检测物与其对应物之间选择性反应

E.某一试验方法对同一样品的重复测定值