按对变量的不同要求，还可将整数规划分为下述几种类型：
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【C2】
A. guideline
B. schedule
C. scheme
D. catalog
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
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