【简答题】燃料电池是一种新型的无污染、无噪音、高效率的汽车动力和发电设备,试解答下列问题: (1)宇宙飞船上的氢氧燃料电池,其电极反应为:2H 2 -4e - +4OH - = 4H 2 O, O 2 +2H 2 O+4e - = 4OH - ,正极发生的是___________反应(填氧化或还原),总反应方程式是:________________ (2)燃料电池在发电的同时还生成了水,这正好解决了宇航员在...
【简答题】Is it not a wonder to have so many twins sit here together?(翻译)
【单选题】Susan is the daughter of my brother, so she is the ______ of mine.
【简答题】根据录音中的短文,选择正确答案。 1.Susan was the name of ______. [ ] A.the careless mother B.the daughter C.the writer 2.Susan was good at ______. [ ] A.growing trees B.keeping cats C.growing flowers and keep...
【单选题】2006年6月20日,蓝灰相同的奔驰氢燃料电池公共汽车驶出北京某公交站,实现了我国第一辆零排放的公交车.下列关于此氢燃料电池的说法不正确的是( )
【简答题】A.To remove the dandelions. B.To enjoy the garden scene. C.To have a talk with her daughter. D.To help her daughter with the play.
【简答题】燃料电池是一种新型的无污染、无噪音、高效率的汽车动力和发电设备。试解答下列问题: (1)宇宙飞船上的氢氧燃料电池,其电极反应为:2H 2 -4e - +4OH - =4H 2 O;O 2 +2H 2 O+ 4e - =4OH - ,正极发生的是______反应(填 “氧化”或“还原”),总反应方程式是:_____________ (2)燃料电池在发电的同时还合成了水,这正好解决了宇航员在太空中饮水...
【简答题】能源短缺是人类社会面临的重大问题。甲醇是一种可再生能源,具有广泛的开发和应用前景。直接甲醇燃料电池(DNFC)被认为是21世纪电动汽车最佳候选动力源。 (1)工业上一般采用下列两种反应合成甲醇: 反应I:CO(g)+2H 2 (g) CH 3 OH(g) △H1 反应Ⅱ:CO 2 (g)+3H 2 (g) CH 3 OH(g)+H 2 O(g) △H2 ①上述反应符合“原子经济”原则的是____(...
【简答题】A.To remove the dandelions. B.To enjoy the garden scene. C.To have a talk with her daughter. D.To help her daughter with the play.
【简答题】请翻译:. On many carbureted engines, the float bowl is also vented to this canister.