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问题 单项选择题

混悬剂中药物粒子的大小一般为( )。

A．＜10nm

B．500～10000nm

C．＜0.1nm

D．＜5nm

E．＜100nm

答案

参考答案：B

解析：[知识点] 混悬剂

选择题

---- It is said that Tom considered the English exam to be very difficult.

---- I have heard that, but he never studied hard. It is “______”.

A．A burden of one's choice is not felt.

B．Actions speak louder than words.

C．A bad workman always blames his tools.

D．A man of words and not of deeds is like a garden full of weeds.
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单项选择题

甲型H1N1流感暴发疫情指（）天内，出现2例及以上具有流行病学联系的甲型H1N1流感疑似和/或确诊病例。

A、10

B、14

C、7

D、20
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