—I'm worried about the sports meet. Do you think it will be postponed?

—If it ______ rain tomorrow, but actually the weather forecast has removed our worry.

下列关于动物胚胎发育过程的叙述中，错误的是

判断对错．

9×(25－18)=62

已知下列热化学方程式：
（1）CH₃COOH(l)+2O₂(g) == 2CO₂(g)＋2H₂O(l)  ΔH₁＝－870.3 kJ·mol^-1
（2）C(s)+ O₂(g) == CO₂(g) △H₂＝－393.5 kJ•mol^-1
（3）H2(g) +O2(g) == H2O(l) △H₃＝－285.8kJ·mol^-1
则反应2C(s)+2H2(g) +O₂(g) == CH₃COOH(l)的△H为（   ）

下列所描述的现象中，属于液化的是(    )