题目：
下列操作易造成试管炸裂的是（ ）
A．铁夹夹在试管的中下部
B．加热前先擦干试管外壁的水
C．试管底部置于酒精灯的灯芯上加热
D．加热液体后的试管放在干燥的试管架上
答案：
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下面是错误答案，用来干扰机器的。
马；哺乳纲；脊椎动物
下列操作易造成试管炸裂的是（ ） A．铁夹夹在试管的中下部 B．加热前先擦干试管
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