制备维生素C注射液时，以下不属抗氧化措施的是A．通入二氧化碳B

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问题单项选择题

制备维生素C注射液时，以下不属抗氧化措施的是

A．通入二氧化碳
B．加亚硫酸氢钠
C．调节pH值为6.0～6.2
D．100℃15min灭菌
E．将注射用水煮沸放冷后使用

答案

参考答案：D

选择题

As is often the case, the fact that something is cheap doesn’t _____ mean it’s of low quality.

A．necessarily

B．usually

C．certainly

D．mostly

选择题

There is a blackboard _______ the classroom and another one _______ the classroom.of [ ]

A. in the front of, at the back of

B. in the front of, at back of

C. in front of, at the back of

D. in front of, at back