A:15000
B:16250
C:17500
D:70000
下列实验中,找到电荷间相互作用规律的实验是( )
阅读短文,回答问题。
I'm David. I'm an English boy. Now I'm in Wuhan. It's very hot and sunny here. I wear my new cap and T-shirt. But my shoes are old and small. I think I'll get a new pair of shoes on my birthday.
用除法表示下面的分数
1311 =____ ÷ ____