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【单选题】
航空发动机的推进效率是什么A.
可用功率与燃油化学能的比
B.
推进功与可用功率的比
C.
推进功与燃油完全燃烧的放热量之比
D.
有效推力和推力之比
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举一反三
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【简答题】Task 2 Read the passage. Choose the best answer to each question. In England, most people live in areas. More and more families would rather have their own house than rent one. When buying their...
【简答题】Task 1 Read the passage. Choose the best answer to each question. In England, most people live in areas. More and more families would rather have their own house than rent one. When buying their...
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