A:“热冰”是纯净物
B:B“热冰”在任何条件下都不会融化
C:水变为“热冰”属于化学变化
D:结成“热冰”后,分子停止运动
2014年是我国第一颗原子弹爆炸成功50周年。我国是爱好和平的国家,却依然研制出原子弹,其主要原因是( )
What did the boy do last night?
—It's a long story, but you will find that there are few new words in it .—Good! it will be too hard for children.