1. How to classify what is the fuel used in fuel cells? e.g. Oxygen or hydrogen? Methanol or oxygen?
2.
圖片參考:http://imgcld.yimg.com/8/n/HA00647229/o/20131026090230.jpg
Please add explanations as well.
3.
圖片參考:http://imgcld.yimg.com/8/n/HA00647229/o/20131026091156.jpg
Explain the answer.