下列实验操作中，不正确的是
答案：B
分析：A、量取液体时，视线没与液体的凹液面最低处保持水平；
B、熄灭酒精灯要用灯帽盖灭；
C、取用粉末状或小颗粒状的药品时要用药匙或纸槽；
D、滴液时胶头滴管要竖直放在试管口上方．
解答：解：
A、量取液体时，视线没与液体的凹液面最低处保持水平，图中操作错误，故A正确
B、熄灭酒精灯要用灯帽盖灭，为防止失火，不可用嘴吹灭．故B错误；
C、操作：先将试管横放，把盛药品的药匙或纸槽小心地送入试管底部，再使试管直立，图中操作正确，故C正确；
D、滴液时胶头滴管要竖直放在试管口上方，不能伸入试管里，故D正确．
故选B．
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