某一化学反应: 2 A + B ─→ D 是一步完成的, B 的起始浓度为 0 . 5 mol · L -1 , 5min 后B的浓度为 0 . 3 mol · L -1 ,则 B 组分的反应速率为( ) mol ( min · L) -1 。 (2.0分) A. 0 . 04 B. 0 .0 2 C. 0 . 06 D. 0 . 03
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