题干

下列4个坐标图分别表示4个实验过程中某些质量的变化,其中正确的是(   )

A

B

C

D

向一定量石灰石中滴加稀盐酸

向一定量的二氧化锰中加入过氧化氢溶液

加热一定量高锰酸钾固体

向一定量硫酸铜溶液中不断加入铁粉

A:A  

B:B  

C:C  

D:D

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C

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