A.10%~60%B.15%~70%C.15%~85%D.20%~85%
A.ⅠB.ⅡC.ⅢD.Ⅳ
A.波形規(guī)則,呈指數(shù)快速衰減,持續(xù)時(shí)間短B.波形較規(guī)則,呈快速衰減,持續(xù)時(shí)間較短C.波形欠規(guī)則,呈逐步衰減或間歇衰減趨勢(shì)形態(tài),掃持續(xù)時(shí)間較長D.波形不規(guī)則呈慢速衰減或間歇增強(qiáng)后衰減形態(tài),持續(xù)時(shí)間長