从热力学角度分析，煤气中CO在上升过程中，当温度降低400～600℃时可发生2CO=CO2+C反应。
参考答案：对
根据汉语提示写出相应的单词。
1. He is a _____ (成员) of the Communist Party.
2. They _____ (回到) home after school yesterday.
3. The Young Pioneers clean the rooms for the old grandma _____ (自己).
4. The snow will _____ (融化) when spring comes.
5. He went to school _____ (没有) breakfast.
下列属于条件反射的是
①画饼充饥 ②老马识途 ③鹦鹉学舌 ④杯弓蛇影 ⑤公鸡报晓 ⑥大雁南飞
A．①②③④
B．①②③⑤
C．②③⑤⑥
D．①④⑤⑥
