单选题在制药时,为从溶液中提取抗菌素,要用加热的方法使水沸腾而除去水分,但抗生素不能在超过80℃的条件下提取,应采用的办法是()。A增加容器内的气压,使水的沸点低于80℃B降低容器内的气压,使水的沸点低于80℃C缩短加热沸腾的时间D用微火加热使其沸腾

单选题
在制药时,为从溶液中提取抗菌素,要用加热的方法使水沸腾而除去水分,但抗生素不能在超过80℃的条件下提取,应采用的办法是()。
A

增加容器内的气压,使水的沸点低于80℃

B

降低容器内的气压,使水的沸点低于80℃

C

缩短加热沸腾的时间

D

用微火加热使其沸腾


参考解析

解析: 此题要求降低水的沸点才能提取抗菌素,根据沸点和气压的关系,气压越大,沸点越高,气压越小,沸点越低,所以答案为B。

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