A:胶体
B:溶液
C:悬浊液
D:乳浊液
⑴____ A. book B. good C. food D. classroom
⑵____ A. pens B. teachers C. apples D. cats
⑶____ A. like B. history C. Friday D. time
⑷____ A. decision B. station C. attention D. pollution
⑸____ A. happy B. family C. what D can
防弹衣是由什么材料制成的?( )
新年联欢会,一位同学手持一面小鼓,置于点燃的蜡烛附近,鼓面面对烛火,敲响小鼓,周围同学看到烛火随着鼓声舞动。对这一现象解释不正确的是( ).