根据所学知识回答下列问题： (1)酒精灯是实验室常用的加热仪器，当实验结束需熄灭
题型：填空题
问题：
根据所学知识回答下列问题：
(1)酒精灯是实验室常用的加热仪器，当实验结束需熄灭酒精灯时，应 。
题型：填空题
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