A:①②
B:②④
C:②③
D:①④
①
What does Emma's father like to watch on TV?
____
②
How many pairs of basketball shoes does Emma's father have?
③
Where are the CDs?
④
How many tennis balls does Emma's father have?
⑤
What kind of food does Emma's father like?
根据欧姆定律可导出公式R=UI,依此可测定导体的电阻,下列说法中正确的是 ( )