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【单选题】
关于煮沸灭菌法，下列哪项说法不当（ ）。A.
持续煮沸20分钟可杀灭一般细菌
B.
持续煮沸1小时可杀灭带芽胞细菌
C.
加入碳酸氢钠，是因为碱性化学作用有助于灭菌
D.
一般压力锅的温度可高达l240C
E.
在2％碳酸氢钠溶液中煮沸灭菌有防止金属器械生锈的作用
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反馈参考答案：
举一反三
【判断题】包装是指为在流通过程中保护商品,改变储运、促进销售,按一定技术方面而采用的容器、材料及辅助的总体名称。也指为了达到上述目的而采用的容器、材料及辅助物的过程中施加一定技术方法等的操作活动。
A.
正确
B.
错误
【单选题】Though she isn't British by birth, she's British citizen by virtue of her marriage to an Englishman.
A.
on account of
B.
depending on
C.
by means of
D.
judging from
【单选题】She developed paralysis(瘫痪), after giving birth to a large calf. That changed her status from milk producer to 'downer', the dairy industry's word for a cow unable to stand up. The United States Depar...
A.
Cows that have give birth to calves.
B.
Cows that have produced milk.
C.
Cows that are less than 30 months old.
D.
Cows that cannot stand up.
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