______ are used to show relationships between different data series that are independent of each other. In this case， the height or length of the bar indicates the measured value or frequency. （）

______ are used to show relationships between different data series that are independent of each other. In this case， the height or length of the bar indicates the measured value or frequency. （）
A、bar chart
B、pie chart
C、diagram
D、line chart
正确答案：D