A、<img src="https://learning.mhtall.com/upload/uc_course/10023/5ADEBA09F00F050D33216263889C05952207726E.png" alt="">
B、<img src="https://learning.mhtall.com/upload/uc_course/10023/AFA00B715F1C6640872D80A565A21102CA5EFB79.png" alt="">
C、<img src="https://learning.mhtall.com/upload/uc_course/10023/538E1822501D2AD44446BCF7CED09C6B358E9CA5.png" alt="">