A：常温下，23g NO2含有nA个氧原子
B：1L0.1mol·L-1的氨水含有0.1nA个OH―
C：常温常压下，22.4LCCl4含有个nA个CCl4分子
D：1molFe2+ 与足量的H2O2溶液反应，转移2nA个电子
Steve's activity on Sunday
In the past
He spent most of the time 1.
He learnt it from his 2 and he is good at it.
Now
He spends at least 3 hours collecting rubbish.
He would like to protect the beach.
与血浆相比，健康人的尿液中不含（ ）
