We can read 10: 15 like this: .
A：a quarter to ten
B：a quarter past ten
C：ten fifteen
D：B and C
Who is good at swimming? -
下面三个电学实验：a、探究电流与电压的关系；b、探究电流与电阻的关系；c、伏安法测电阻都要用到滑动变阻器，关于滑动变阻器，下列说法错误的是（ ）
