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【单选题】
下列实验基本操作或实验注意事项中，主要是出于实验安全考虑的是（　　）
A.
实验剩余的药品不能放回原试剂瓶
B.
可燃性气体点燃前验纯
C.
气体实验装置在实验前进行气密性检查
D.
滴管不能交叉使用
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