实验是实现�学探究的重要途径.请回答以下有关化学实验的问题.1下列实验操作中不正确的是 .�制备气体前检查装置的气密性�加热实验结束时用 Template




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tomski实验是实现�学探究的重要途径.请回答以下有关化学实验的问题.1下列实验操作中不正确的是 .�制备气体前检查装置的气密性�加热实验结束时用 coloring