A、<img src="https://learning.mhtall.com/upload/uc_course/1843/63469ADD54685A33C0BF237AE283CE4966402806.png" alt="">
B、<img src="https://learning.mhtall.com/upload/uc_course/1843/600CD9A9A08DA8337DF267E746E82F93C8422B6F.png" alt="">
C、<img src="https://learning.mhtall.com/upload/uc_course/1843/FC168F853063F58DE7EAC530AC4C631D38F36498.png" alt="">