a.CH3CH2OH(g)+H2O(g)=4H2(g)+2CO(g)△H1=+256.6kJ•mol﹣1
b.2CH3CH2OH(g)+O2(g)=6H2(g)+4CO(g)△H2=+27.6kJ•mol﹣1
则下列说法正确的是( )
A:升高a的反应温度,乙醇的转化率增大
B:由b可知:乙醇的燃烧热为13.8 kJ•mol﹣1
C:2H2(g)+O2(g)=2H2O(g)△H=+485.6 kJ•mol﹣1
D:制取等量的氢气,途径b消耗的能量更多
飞机在平直跑道上由静止开始匀加速起飞,经20s离地时行驶距离为1200m,求:
根据句意及所给中文提示或英文解释,写出句中所缺单词,每空限填一个单词。People like travelling in ____ (春天) because it is neither too hot nor too cold.—What's your father's ____ (职业)?—He is a doctor.The 30th Olympic Games will be held in London, the ____ (首都) of England.Lucy is polite and ____ (乐于助人的). We all like her.Our maths teacher asked you to go to his office____ (立即). He is waiting for you.Colours can change our moods and some may make us feel ____ _ (in need of sleep).Hurry up, or we can't____ (arrive at) the railway station on time.
下列各项叙述与下边图像人物情况不相符的是( )