题目内容

将某线性规划问题模型化为标准型时，如果某决策变量x1是自由变量，应该将该变量替换为。

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在化标准型时，需要将不等式约束条件化为等式，在不等式约束条件中增加剩余变量或松弛变量，这些剩余变量或松弛变量在目标函数的系数是。

We arrived too late for the concert, just as the musicians were already packing ___ their instruments.

A. up
B. in
C. with
D. on

In extreme sports (such as parachuting), you take the risk that you may wind ____ seriously injured or even dead.

A. in
B. up
C. with
D. on

They hardly scrape____ enough money for the train fare.

A. in
B. with
C. up
D. on