题目内容

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 。

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

A. up
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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
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They hardly scrape____ enough money for the train fare.

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