Bt and Ecd
,
Parameters
:U_Bt=300,t_Bt=0,U_cd=300,t_cd=500,O_Bt='CW',O_cd='CW'
,,
:U_Bt=300,t_Bt=0,U_cd=300,t_cd=500,O_Bt='CW',O_cd='CW'
