题目内容

【C2】

A. guideline
B. schedule
C. scheme
D. catalog

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动态规划中指标函数的基本概念。

写出下列线性规划问题的对偶问题:minZ=2x18x2−4x3{x13x2−3x3≥30−x15x24x3=804x12x2−4x3≤50x1≤0,x2≥0,x3无限制

The reason why the four other climate pollutants can disappear in a matter of weeks is that______.

A. nearly 100 ozone-depleting chemicals have been phased out under the Montreal Protocol
B. they account for as much as 40 percent of current warming
C. more than 100 countries support a shift to the safer HFC alternatives
D. they are short-lived in the atmosphere

若要对某点进行比例、旋转变换,首先需要将坐标原点平移至该点,在新的坐标系下做比例或旋转变换,然后在将原点平移回去。()

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