病因研究中形成病因假设的Mill准则不包括下列哪个
A．验证法B．求同法C．求异法D．剩余法E．共变法
参考答案：A
请用所给动词的适当形式填空。
1. She ____________ (like) her brother very much.
2. I ____________ (not go) to school by bike every day.
3. We usually ____________ (get) up early in the morning.
4. Lucy ____________ (not sing) very well.
5. ____________ (be) Mary ____________ (have) an English class now?
6. My mum ____________ (do) housework at home. She ____________ (not have) a job.
7. Miss Lee usually ____________ (help) me with my lessons.
8. He ____________ (do) homework and ____________ (watch) TV in the evening.
9. I like ____________ (read) books and ____________ (dance) after school.
10. Lily is ____________ (play) the piano now.
平面直角坐标系中，A点在x轴的正半轴上，B点在y轴的正半轴上，C点在x轴的负半轴上，且已知∠ABC=90°，，则过A、B、C三点的圆的方程为（）。
（E）以上结论都不正确
A.A
B.B
C.C
D.D
E.E
，则过A、B、C三点的圆的方程为（）。