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【单选题】
考虑氢作为发动机燃料是因为 ( )
A.
(A) 氢燃烧时放出大量热
B.
(B) 氢及其燃烧的产物都是无毒的
C.
(C) 氢燃烧放出的热量约为等量汽油的三倍
D.
(D) 以上三者都正确
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