考研习题练习

考研易错题(2019/3/6)
1题:简述夸美纽斯的教育适应自然原则。
【分析题】:

2题:
,而中间变量u满足关系式
,其中u(x,y)和f(u)均为可微函数,如果
,则u(x,y)=______.
【分析题】:

3题:
【分析题】:

4题: 人类社会有史以来存在的两种类型的经济形式是 ( )
A.自然经济和商品经济
B.计划经济和市场经济
C.商品经济与产品经济
D.商品经济与市场经济
【单选题】:      

5题:The writer does not believe that______.
A.an asteroid is larger than a meteorite
B.material from space, upon hitting the earth, was eventually distributed
C.the earth, at one time, had craters
D.oceans were formerly craters
【单选题】:      

 

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