A:(﹣ 35 , 45 )
B:(﹣ 35 ,﹣ 45 )
C:( 35 , 45 )
D:( 35 ,﹣ 45 )
下列用电器中,工作电流为0.1 mA的可能是( )
You had better learn to _________ different kinds of problems by yourself.