Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has an efficiency of 40% to produce electricity C. uses aluminium as catalysts D. is eco-friendly E. is actually a type of Galvanic cell only
- AA, B, C only
- BA, B, D only
- CA, B, D, E only
- DA, D, E only
✓ Correct answer: D
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