培养细胞前生物安全柜或超净工作台要经紫外线消毒，照射时间最好_爱下问搜题

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问题单项选择题 A1/A2型题

培养细胞前生物安全柜或超净工作台要经紫外线消毒，照射时间最好为（）

A.15min

B.25min

C.30min

D.45min

E.60min

答案

参考答案：C

选择题

With so many people ____ in English, it will become more and more important to have ____ of English.

A. communicate; good knowledge
B. communicating; good knowledge
C. communicating; a good knowledge
D. communicate; a good knowledge

单项选择题

下列原料中粘结性最好的是（）。

A.耐火粘土

B.焦粉

C.熟料粉