工业废气NO、NO2是造成大气污染的气体之一，工业上常用原理：NOx + NH3→N2 + H2O，使其转化为无毒的N2，现有NO、NO2的混合3.0 L，可与3.5 L相同状况的NH3恰好完全反应，全部转化为N2，则在原混合气体中NO和NO2的物质的量之比是
| A．1:1 | B．2:1 | C．3:1 | D．1:3 |
相关试题
The CDs are on sale! Buy one and you get ______ completely free.
| A．other | B．others | C．one | D．ones ks |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
粤公网安备 44130202000953号