可以造成汽车蓄电池电量不足的原因是()。
A.电压调节器调整不当
B.风扇皮带打滑
C.蓄电池极板硫化
D.电解液量不足
E.凸轮轴机构磨损
参考答案:A, B, C, D
What a great weight she felt ________ off her mind the moment she heard she had passed the College Entrance Examination!
A.take
B.to take
C.taking
D.taken
一定条件下,下列反应中水蒸气含量随反应时间的变化趋势符合下图的是( )
温度(T)的影响 压强(p)的影响
A.CO2(g)+2NH3(g) CO(NH2)2(s) + H2O(g);△H<0
B.CO2(g)+ H2(g) CO(g) + H2O(g);△H>0
C.CH3CH2OH(g) CH2=CH2(g) + H2O(g);△H>0
D.2C6H5CH2CH3(g) + O2(g ) 2C6H5CH=CH2(g) + 2 H2O(g);△H<0