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【单选题】
下列对质量守恒定律的理解中正确的是 ( )A.
参加反应前后各物质的质量不变
B.
化学反应前后各物质的质量不变
C.
化学反应前的各物质质量总和等于反应后生成的各物质质量总和
D.
参加化学反应的各物质质量总和与反应后生成的各物质质量总和相等
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