已知方程x3+(2m-3)x+m2-m=0有三个相异实根，分别介于(-∞，0)，(0

当需要的破碎量一定时，锤式碎煤的锤头质量与速度成（）。

A.反比

B.正比

C.没有关系

单词拼写根据句首字母和汉语提示，完成单词。

1. She works in a police station. She is a p_________.

2. My mother is sleeping, please be q_________.

3."What are you doing?""I am _________(写)a letter."

4. I am very _________(感到惊讶的)he can swim.

5. I like to go skating(滑雪)on a s_________ weekend in winter.

6. They come from C_________. They live in Toronto.

7. How's it going? It's _________(很糟糕).

8. Don't turn l_________. Turn right. Then you can find the post office on your fight.

9. She is _________(从不)late for school.

10. Jay Chou is a good singer. He's very _________(受欢迎的).

澶渊之盟发生在哪两个 * * 之间？ [ ]

A．辽和西夏

B．北宋和辽

C．北宋和西夏

D．北宋和吐蕃

对淀粉、蛋白质、脂肪都有消化作用的消化液的是（　　）

A．唾液

B．胃液

C．胆汁

D．胰液

生长激素缺乏症最佳的治疗方法是()

A．GH替代疗法

B．糖皮质激素

C．绒毛膜促性腺激素

D．中草药

E．甲状腺素片