根据法律关系所体现的社会内容的性质，将法律关系可以分为( )A．基本法律关系 B．

已知sin( π 4 +x)= 5 13 ，x∈( π 4 ， 3π 4 )，则 1+tanx 1-tanx 的值为______．

情景对话。从所给的选项中选择最佳项完成对话。

A. Are you feeling better? B. Where shall we meet? C. What are you doing? D. I'm feeling better. E. Would you like to go with me? F. When shall we meet? John: Hello, Jim. This is John.    1    Jim: I'm staying in bed. I had a bad cold. John: I'm sorry to hear that.    2    Jim: Yes. My mother took me to the hospital. What's the matter? John: I got two tickets to Titanic this evening.    3     Jim: Yes, I'd like to. John:    4    Jim: Let's meet at half past six. John:    5    Jim: Let's meet at the school gate. John: OK. See you then. Jim: See you.

1.                2.               3.                4.               5.            

妊娠晚期需用解热镇痛药时应选用

A．喹诺酮类抗生素
B．阿司匹林
C．对乙酰氨基酚
D．微量元素
E．四环素

体现了团结互助要求的是（）

A.三个臭皮匠，胜过诸葛亮

B.三人行，则必有我师焉

C.以子之矛，攻子之盾

D.人敬我一尺，我敬人一丈

基质酸化排量等于压裂酸化排量。（）