皮皮学，免费搜题
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【单选题】
氧气与乙炔的混合比值为1.1~1.2时,其火焰性质为______。
A.
中性焰
B.
氧化焰
C.
碳化焰
D.
混合焰
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【单选题】W: The movie begins at seven. M: We' d better hurry up. There' s only fifteen minutes left. 21. What time is it now?
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