将一盛满Cl2的试管倒立在水槽中，当日光照射相当长一段时间后

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将一盛满Cl₂的试管倒立在水槽中，当日光照射相当长一段时间后，试管中最后剩余气体体积约占试管容积的

A．1/4

B．1/3

C．1/2

D．2/3

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