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【简答题】
分离变量法在直角坐标系中求解三维偏微分方程 时, 其第一令 __________________, 方程后将得到__个 ___________方 程。
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举一反三
【单选题】Monopolistic competition differs from perfect competition primarily because______.
A.
in monopolistic competition, firms can differentiate their products
B.
in perfect competition, firms can differentiate their products
C.
in monopolistic competition, entry into the industry is blocked
D.
in monopolistic competition, there are relatively few barriers to entry
【多选题】谈及曹操的《蒿里行》其艺术价值不凡,以下对该作品赏析正确的是( )。
A.
真实反映了汉末动乱的现实，堪称“汉末实录”。
B.
是曹操按旧题写的新辞，表达作者一统天下的抱负。
C.
该诗的背景起于曹操北征乌桓升胜利班师回朝有感而发。
D.
该诗在艺术气质方面具有“古直悲凉”的特点，需要细细体味才能理解。
E.
该浑厚质朴，不加雕琢；慷慨悲凉，富于同情心。 答案:AE
【简答题】平面交叉口有何交通特征?如何减少或消灭交叉口冲突点?
【单选题】One difference between perfect competition and monopolistic competition is that
A.
a perfectly competitive industry has fewer firms.
B.
in perfect competition, firms produce slightly differentiated products.
C.
monopolistic competition has barriers to entry.
D.
firms in monopolistic competition face a downward-sloping demand curve.
【单选题】The gains from free trade are enjoyed by a ________ number of people and the costs of free trade are imposed by ________ number of people.
A.
small; large
B.
large; small
C.
small; small
D.
large; large
【简答题】平面交叉口有何交通特征？如何减少或消灭交叉口冲突点？
【单选题】An example of' product in monopolistic competition is ______ .
A.
corn
B.
electricity
C.
airline tickets
D.
coffee
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