下列叙述正确的是( )
A:O2和O2互为同位素,化学性质相似
B:C(石墨,s)=C(金刚石,s)△H>0,所以石墨比金刚石稳定
C:明矾和漂白粉常用于自来水的净化和杀菌消毒,两者的作用原理相同
D:常温下,pH=1的水溶液中Na+、NO3﹣、HCO3﹣、Fe2+可以大量共存
根据句意及首字母提示完成单词
①He enjoys the food in the r____ a lot and he often goes there to eat.
②My favorite movie s____ is Sun Li.
③—What is Betty's father doing?
—He is d____ his car to work.
④The young woman is l____ home for work.
⑤My father isn't working at the m____.
2013年4月22日是第44个世界地球日,中国地球日的主题是
一个100 cm3的铜球(铜的密度为8.9×103 kg/m3),用天平测出它的质量为100 g,那么这个铜球的内部()