问答题

‍与原问题中无约束变量对应的对偶问题约束为约束。

答案：等式

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单项选择题

Scientists have been trying hard to think of better ways to harness solar energy. Here the word harness most likely means_________ .

A．recycle
B．control and use
C．catch and absorb
D．save and conserve

装主板的底板和后背板(插键盘的那面)不是90度。容易把备种板卡的档板弄弯，系统不稳定。
正确
错误

答案：正确