She her every evening at home.
A:does; homework
B:does; homeworks
C:do; homework
D:do; homeworks
日本传统民居,多用质地较轻的建筑材料建筑的主要原因是( )
设全集U={1,2,3,4,5},集合A={1,2},B={2,3},则A∩(∁UB)=( )
如图甲所示是电阻R和小灯泡L的U﹣I图象,由图可知电阻R的阻值是 ____ Ω;若将电阻R与小灯泡L串联在电路中(如图乙),电流表示数为0.4A,则电源电压为 ____ V.