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【单选题】
反应 A ─→ 2B 在温度 T 时的速率方程为 d[B]/d t = k B [A] ,则此反应的半衰期为:A.
、 ln 2/ k B
B.
、 2ln 2/ k B
C.
、 k B ln2
D.
、 2 k B ln2
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