【单选题】【消耗次数：1】
Not until the early years of the 19th century ____ what heat is.
①
man knew
②
did man know
③
man did know
④
didn’t man know
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随机题目
【单选题】
以太网线路利用率，说法错误的是（）
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要提高以太网的信道利用率，就必须减小?与T0之比
②
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④
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