某化学小组同学用如图所示实验探究质量守恒定律.1充分反应冷却后天平仍然平衡的是 .2由上述实验可知在化学反应前后一定不变的是 Template




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tomski某化学小组同学用如图所示实验探究质量守恒定律.1充分反应冷却后天平仍然平衡的是 .2由上述实验可知在化学反应前后一定不变的是 coloring