下列实验操作中,正确的是    A.给试管内的液体加热时,试管口

下列实验操作中,正确的是

    A.给试管内的液体加热时,试管口不能对着人

    B.向试管里滴加液体药品时,胶头滴管应伸入试管内

    C.用托盘天平称量时,把称量物放在右盘,砝码放在左盘

    D.酒精灯用毕,应立即用嘴吹灭火焰

 

 

答案

A

解析:略

 

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