试题与答案

1Pa的声压换算成声压级为多少?

题型:问答题

题目:

1Pa的声压换算成声压级为多少?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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对分离细胞的保存,下列说法错误的是()

A.用适量的含有1O%~20%灭活小牛血清的Hanks等培养液释稀重悬,培养液要求等渗,具有pH缓冲作用,并对细胞无毒性

B.细胞冷冻时降温的速度宜慢,解冻时升温的速度宜快

C.短期保存时,可放4℃保存较好

D.短期保存时,迅速改变细胞所处的温度,以免造成温度休克

E.长期保存时,应放入液氮罐中在深低温条件下保存,并加入二甲亚砜冷冻保护剂

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