单位pg相当于( )

A、10[img=~\/QImg\/2013-06-26-17-11-54\/image006.gif]g
B、10[img=~\/QImg\/2013-06-26-17-11-54\/image007.gif]g
C、10[img=~\/QImg\/2013-06-26-17-11-54\/image008.gif]g
D、10[img=~\/QImg\/2013-06-26-17-11-54\/image009.gif]g
E、10[img=~\/QImg\/2013-06-26-17-11-54\/image010.gif]g