下列各图中,小磁针静止时N极指向正确的是( )
①Susie want toast two tall postmen some lemonade a thirsty crow
②how do you feel were very hungry
用下表三台显微镜(编号为A、B、C)分别观察同一装片的洋葱表皮细胞.请回答下列问题:
台号
目镜
物镜
A
5×
8×
B
10×
C
15×
40×