Fuel cell engines（燃料电池发动机） are two to three times more efficient than combustion engines， meaning that much greater fuel economy is available using hydrogen in a fuel cell.

Fuel cell engines（燃料电池发动机） are two to three times more efficient than combustion engines， meaning that much greater fuel economy is available using hydrogen in a fuel cell.
A.正确
B.错误
正确答案：正确