术前正畸的目的不包括（） A.排齐牙列 B.整平牙弓 C.解除后牙反牙合 D.消除牙

请你观察上图的变化过程，说明四条边形的四条边一定时，其面积（    ）确定。（填“能”或“不能”）

情景作文。

     人人都有朋友 初中三年同学之间结下深厚的友谊。假设你叫张华，你的笔友李敏在下面

这封信中介绍了他的学友，请你写一封70 词左右的回信，说说你好友的基本情况和兴趣爱好。

注意：1、回信的开头和结尾已给出，但不计入总词教：

          2、信中请勿使用朋友的真实校名和姓名

Dear Zhang Hua,

     How are you? In this letter I'd like to say something about my best friend.

     My best friend is Gao Jun. He is fifteen. He is tall with short hair. We are in the same class.

     Gao Jun is smart and friendly in class, he listens to the teachers carefully At home, he often helps

his mother with housework He does well in all his lessons. And he is always ready to help others. So,

everyone in our class likes him.

     Gao Jun seems to have a special interest in writing. He wants to be a writer in the future.

     Both of us like playing basketball. We usually play it after class. We feel happy when we are together.

I think we will be good friends forever.

     What about your best friend? Can you tell me something about him (her)?

                                                                                                                                         Yours,

                                                                                                                                         Li Min

Dear Li Min,

     Thank you for telling me so much about your best friend Gao Jun. __________________________

____________________________________________________________________________________

                                                                                                                                   Yours,

                                                                                                                                  Zhang Hua

抑阳酒连散功效与作用

下列叙述错误的是

A．吗啡是μ受体的激动药
B．强啡肽是κ受体的激动药
C．纳洛酮可拮抗喷他佐辛的中毒症状
D．烯丙吗啡可拮抗喷他佐辛的中毒症状
E．烯丙吗啡是μ受体拮抗一激动药

根据梁的挠度和支架的变形所计算出来的预拱度之和，为预拱度的最高值，应设置在梁的( )。

A．最前端

B．最末端

C．任意位置

D．路径中点