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简述系统测试的基本步骤。

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He has ________ on his farm.

A. 20 head of cattles
B. 20 heads of cattles
C. 20 heads of cattle
D. 20 head of cattle

下列选项中，()也称主次图，是直方图与折线图的结合，直方图用来表示属于某项目的各分类的频次，而折线点则表示各分类的累积相对频次。

A. 趋势图
B. 柱状图
C. 排列图
D. 控制图

If she feels like it, she can work in a hospital as a part-time nurse.

Although she was very poor, the woman set aside part of her income for the education of her child.