The arithmetic average index is obtained by weighted average using the individual index of the quantity indicator and the value index of the base period as the weight. ()
举一反三
- The price index is a weighted average and can be expressed in terms of the range of price changes relative to the base period.
- 下面类的索引定义或使用正确的是（）。 A: class MyClass{ int x; int y; public int this[int index] { get{ if (index==0) return x; else return y; }}｝ B: class MyClass{ int x; int y; public int this[int index] { set{ if (index==0) x=value; else y=value; }}} C: class MyClass{ int x; int y; public int INDEX[int index] { get{ if (index==0) return x; else return y; } set{ if (index==0) x=value; else y=value; }}} D: class MyClass{ int x; int y; public int this[int index] { get{ if (index==0) return x; else return y; } set{ if (index==0) x=value; else y=value; }}}
- 下面哪个属性可以获取下拉框的索引值 A: options[index].value B: options[index].text C: selectedIndex D: index
- 已知x=[3,2,3,3,4]，表达式[index for index,value in enumerate(x) if value==3]的值为（______ ）。
- 在excel中，计算平均数的函数是（） A: average B: sum C: lookup D: index