问题 选择题

下列实验操作正确的是 ( )

A.取用液体药品时,瓶塞要正放在桌面上,标签要向着手心,瓶口要紧挨着试管口。

B.取用药品时如果没有用量时,液化取3—4ml,固体只需盖满试管底部。

C.给试管滴加少量液体试剂,把胶头滴管伸入试管中。

D.称量易潮解的药品时应放在小烧杯等仪器中称量。

答案

答案:D

A、取用液体药品时,瓶塞要倒放,标签要对准手心,瓶口紧挨;故选项说法错误.

B、要严格按实验规定用量取用药品.如果没有说明用量,一般取最少量,液体去lmL~2mL,固体只要盖满试管的底部.故选项说法错误.

C、使用胶头滴管滴加少量液体的操作,注意胶头滴管的位置是否伸入到试管内或接触试管内壁.应垂直悬空在试管口上方滴加液体,防止污染胶头滴管,故选项说法错误.

D、在托盘天平上称量药品时,如果称量易潮解、有腐蚀性的药品时,必须放到玻璃器皿(小烧杯等)中称量,否则腐蚀托盘,造成称量的误差.故选项说法正确.

故选D.

阅读理解

阅读理解。

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判断题