A:-2
B:2
C:-12
D:12
据图判断,下列叙述不符合生态学原理的是 ( )
-- John, is Henry your twin brother?
-- Oh, yes. He is twenty minutes ____ (old) than me.
如图所示,0~3A挡电流表读数____ A,0~15V电压表的读数为____ V.