A下颌角与锁骨上缘中点联线下/处B下颌角与锁骨上缘中点联线上/处C下颌角与锁骨下缘中点联线下/处D下颌角与锁骨下缘中点联线中/处E下颌角与锁骨上缘中点联线中/处