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【单选题】
将1mol N 2 和3mol H 2 通入4L的密闭容器中反应，半分钟后测得H 2 的物质的量为2.1 mol，现用如下三种物质在单位时间内的浓度变化来表示该反应速率： ① v(H 2 ) = 0.45mol/(L·min) ② v(N 2 ) = 1.05mol/(L·min) ③ v(NH 3 ) = 0.30mol/(L·min) 其中正确的是 [ ]A.
①②
B.
②③
C.
①③
D.
①②③
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