十四经脉上共有361个经穴，其中单穴有（）.A.50个B.52个C.56个D.58个

A.1%~2%

B.1.5%~2.5%

C.2%~3%

D.3%~4%

A.500个

B.800个

C.1500个

D.2000个

A.4.5~5

B.5~5.6

C.5.6~6.6

D.6.5~7.5

A.10%~15%

B.18%~20%

C.20%~22%

D.22%~25%