用酒精灯给物质加热时,应使用酒精灯火焰的 A.内焰部分      B.

用酒精灯给物质加热时,应使用酒精灯火焰的

A.内焰部分      B.外焰部分    C.焰心部分    D.任何部分均可

答案

B

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