当调度下令“退出××站××线相应保护装置”，现场应操作（）。

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问题多项选择题

A.退出××线的远方跳闸

B.退出××线的线路保护

C.退出相关开关的失灵保护

D.现场规程规定需操作的辅助设备

答案

参考答案：A, B, D

单项选择题

An analyst constructs a histogram and frequency polygon of monthly returns for aggressive equity funds over a 20-year period. Which of the following statements about a histogram or a frequency polygon is FALSE（）

A. Both a histogram and a frequency polygon provide a graphical display of data found in a frequency distribution on.

B. A frequency polygon is a bar chart of continuous data that have been grouped into a frequency distribution.

C. The height of each bar in a histogram represents the absolute frequency for each return interval.

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选择题

从4名男生、3名女生中各选出2名组成研究性学习小组，并从选出的4人中再选定1人当组长，则不同选法的种数是（　　）

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