Most of students like to play sports during their holidays. But they exercise in different ways. We did a survey of 100 students  in Liu Chang's class, The picture on the right shows the result, The number of students playing badminton is the largest. Then,     students like playing badminton.

A. 29

B. 27

C. 28

简述肺栓塞时，首选的核医学显像方法及其现象表现。