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