A:how did Tom come to school
B:why was Tom late for school
C:when Tom would get to school
D:what will Tom do at school
纳米是长度单位,1nm=____m,当材料的粒子小到纳米级时,材料的性能会发生显著变化,如____;____;____。(举三例)
“假日越来越多,环境越来越美,私家车越来越多,出游越来越火,网络问政越来越热,寿命越来越长。”这说明( )
①我国已全面建成小康社会 ②人们的生活水平不断提高,生活方式不断变化
③人们的文化生活日益丰富,民主意识不断增强 ④我国已建成富强、民主、文明、和谐的现代化国家