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【单选题】
（ 10 年河南） 下列各组物质充分反应后，溶液质量比反应前的溶液质量减小的是
A.
．铁片浸入稀硫酸中
B.
．铁片浸入硫酸铜溶液中
C.
．氧化铁粉末加入稀盐酸中
D.
．碳酸氢钠粉末加入稀盐酸中
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【单选题】第一次国共合作的政治基础(共同纲领)是( )
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