题目

The team of psychologists said labels such as ‘helicopter parents’, ‘tiger mums’ or ‘little emperors’ undermine（损坏） parents who place their children at the centre of family life, and assume that parents’ needs come last. In reality, by focusing on maximizing their children’s happiness, they enjoy life and their role as parents more, they claimed. Study leader Claire Ashton-James, from VU University in Amsterdam, said there is little research to support the assumption that investing time in your children comes at some personal cost. Together with psychologist coll4．甲醇是一种理想的液体燃料，工业上可利用CO与H2反应合成甲醇，即CO（g）+2H2（g）?CH3OH（l），该反应是放热反应．若在体积为2L的密闭容器中加入4molH2和一定量的CO后，CO和CH3OH（g）的浓度随时间的变化情况如图1所示．（1）该反应在0～3min内用H2表示的反应速率为0.5mol/（L•min）．（2）该反应进行10min后，在其他条件不变时，只降低体系的温度，则该反应的逆反应速率将减小（填“增大”、“不变”或“减小”）．（3）该反应达到平衡状态的标志是ba．混合气体的密度不变            b．H2的生成速率是CH3OH（g）生成速率的2倍c．CO是CH3OH（g）浓度的$\frac{1}{3}$  d．CO、H2和CH3OH（g）的分子数之比为1：2：1（4）甲醇-空气电池是一种高效、低污染的质子交换膜燃料电池，电池总反应为CH3OH+3O2=2CO2+4H2O．图2为该电池的示意图，则该装置中d（填“c”或“d”）为电池的正极．