He likes playing tricks on others, but _________, he is a good boy. He is willing to help others.
A:in this way
B:in some ways
C:in his way
D:on his way
____
如图所示是等腰直角三棱柱,其中底面abcd为正方形,边长为L,它们按图示位置放置于竖直向下的匀强磁场中,磁感应强度为B,下面说法中正确的是( )