单项选择题

A.3MHz,0.5~1.0W/cm2,间歇法
B.0.25~0.5w/cm2,间歇法
C.1~1.5w/cm2,连续法
D.0.25~0.5w/cm2,连续法
E.1Hz,1~1.5w/cm2,间歇法