患者女性，23岁。四天前出现右下后牙区肿痛不适，昨日起疼痛加剧，并出现张口受限。检查

已知半径为5的动圆C的圆心在直线l：x-y+10=0上．（1）若动圆C过点（-5，0），求圆C的方程；（2）是否存在正实数r，使得动圆C中满足与圆O：x²+y²=r²相外切的圆有且只有一个？若存在，请求出来；若不存在，请说明理由．

已知实数a、b、c满足b+c=6-4a+3a²，c-b=4-4a+a²，则a、b、c的大小关系______．

用适当的词填空。

1. We were _____ with joy and jumped _____. (wild)

2. His father died _____ he was only three months old.

3. When did you meet her _____ the first time?

4. It is hard _____ me to work out the maths problem.

5. Do you know how to survive _____ the wild?

6. _____ what do you want to kill the sheep?

7. At an early age, the boy lived _____ his own.

8. _____ four months, the baby weighed 10 kilograms.

9. He will stay here for _____ to 14 days

10. Who has taken my pen _____?

OAPI中一台AFAX可连接几台MFP（）

A.1

B.2

C.3

D.4