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问题 解答题

粮店有“珍珠牌”大米40袋，每袋25千克，如果每千克大米3元，这些大米一共可以卖多少元？

答案

40×25×3，

=1000×3，

=3000（元）．

答：这些大米一共可以卖3000元．

单项选择题

城市供热管网平面布置应遵循主要干管应该靠近( )和热负荷集中的地区，避免长距离穿越没有热负荷的地段的原则。

A．大型用户

B．主要交通干道

C．市中心

D．繁华的街道
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单项选择题

Assume that the supply of ethanol is relatively more elastic than the demand for ethanol. Compared to an initial competitive equilibrium in the market for ethanol, the imposition of a per-gallon tax on producers of ethanol will most likely:（）

A. decrease producer surplus by the total amount of tax collected.

B. decrease producer surplus by less than it reduces consumer surplus.

C. decrease the sum of consumer and producer surplus by the amount of tax collected.
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