During the past half a century, engineers have generally opted to use hydrocarbons, such as kerosene, or hydrogen itself, along with oxygen liquefied at low temperature, as chemical propellants.
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释义
过去半世纪,工程师大多以煤油等碳氢化合物,或是氢本身,加上低温液化氧气做为化学推进燃料。
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