配伍题

B型题 干扰电疗时,电极面积<50cm,其电流密度()|干扰电疗时,电极面积>50cm,其电流密度()

A.0.1~0.2mA/cm
B.0.3~0.4mA/cm
C.0.5~0.6mA/cm
D.0.6~0.7mA/cm
E.0.8mA/cm