不完全市场
参考答案:
既非完全竞争亦非完全垄断的市场,即垄断竞争市场是不完全市场.
下列物质在盛有氧气的集气瓶中燃烧,要预先在瓶里装少量水或铺一层细沙的是( )
A.铁丝
B.硫
C.木炭
D.蜡烛
An ______ test is a rough measure of a child's capacity for learning, particularly for learning the kinds of things required at school.
A.proficiency
B.intelligence
C.psychology
D.speed