单项选择题

人们在（）情况下倾向于减少因投机动机持有的现金量。

A．利率上升
B．利率下降
C．利率不变
D．债券收益率不变

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答案：正确

单项选择题

Manufacturing companies develop linear programming models to help decide how many units of different products they should produce to maximize their profit (or minimize their cost), given scarce resources such as capital, labor, and facilities. ( ）

A．对
B．错