工业合成氨的反应为：N2(g)＋3H2(g) 
2 NH3 (g); △H <0, 该反应应采取的适宜条件是（ ）
| A．低温、高压、催化剂 | B．适宜的温度、高压、催化剂 |
| C．低温、常压、催化剂 | D．适宜的温度和压强、催化剂 |
相关试题
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 |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— ______ , as a matter of fact
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