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当前学科：中小学生安全知识竞赛
题目：
单选题
下列关于实验室灭火常识正确的是（） ①石棉布可适用于大火 ②干沙土是最常用的救火物质 ③二氧化碳灭火器不损坏仪器，不留残渣 ④四氯化碳灭火器不导电，适用于扑灭带电物体的火灾
A
①②
B
③④
C
①③④
D
②③④
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