单项选择题

「せ」和「セ」都是来源于“世”字。 A. 对 B. 错

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‍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

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