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
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