题干

已知某两种物质在光照条件下能发生化学反应,其微观示意图如图(一种小球代表一种原子):则下列说法正确的是(  )

A:参加反应的物质均为化合物

B:该反应属于复分解反应

C:该反应不符合质量守恒定律

D:图示中共有4种分子

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D

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