①____ What's your friend's name? A.Yes, she is.
②____ Does she have long hair? B.Yes, they are.
③____ Are they good friends? C.He's short.
④____ Is your brother tall or short? D.Yes, she does.
⑤____ Is she thin? E.Liu Tong.
白菜2元一斤,菜心3元一斤,小亮有10元钱,则他可以买( )
巴西利亚位于五带中的( )
如图所示,当电源电压为4V时,电压表的示数为1V;当电源电压增加到12V时,电流表的示数为1A,则电阻R1=____ Ω,R2=____ Ω.