Fuel cell, using hydrogen and oxygen as fuels,
A. has been used in spaceship
B. has as efficiency of 40% to produce electricity
C. uses aluminium as catalysts
D. is eco - friendly
E. is actually a type of Galvanic cell only
1
A, B, C only
2
A, B, D only
3
A, B, D, E only
4
A, D, E only