A.B/5+1 B.B/5 C.B/5+2 D.B/5-1
A.0.5/10B B.0.5/10B+3 C.0.5/10B+6
A.2 B.3 C.4 D.5
A.颈窝点 B.右颈间点 C.颈椎点 D.肩端点