2023-04-19
全诗借用大雁，把作者对（）的同情表现了出来。
A、蒙冤的忠臣
B、溃退的军队
C、逃难的百姓
D、南迁的朝廷
参考答案：C
One of the problems with the Clarke tax mechanism is that when it is used， people have an incentive to lie about their preferences.。
2024-01-13 竞赛及其他题库
If a pure public good is provided by voluntary contributions， economic theory predicts that in general too little will be supplieD.。
To say that preferences are single peaked means that everybody either prefers more public goods to less or everybody prefers less public goods to more.。
According to the First Theorem of Welfare Economics：
泵的流量不随压力的变化而变化，以保证有效排粉。
说明单缸单作用往复泵的工作原理？
说明往复式泥浆泵液力端的作用？
往复泵动力端由曲柄连杆结构、十字头和其他机械传动部件。
什么是往复泵的理论平均流量？
往复泵的作用是把动力机的能量传递给活塞。
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