试述民俗学的任务和内容?
参考答案:
任务:帮助我们认识民族历史与文化传统和改造现实社会生活。
内容:民俗学原理,民俗史,民俗志,民俗学史,民俗学方法论,资料学。
下列各组变化中,前者属于物理变化,后者属于化学变化的是 [ ]
A.铜生锈,自行车轮胎爆炸
B.高粱酿酒,红磷燃烧
C.胆矾研碎,酒精燃烧
D.食物腐烂,金属导电
In each production lot for a certain toy, 25 percent of the toys are red and 75 percent of the toys are blue. Half the toys are size A and half are size B.If 10 out of a lot of 100 toys are red and size A, how many of the toys are blue and size B ?()
A.15
B.25
C.30
D.35
E.40