乌头碱的致死量为
A.30mg
B.5~10mg
C.2~4mg
D.0.5mg
E.0.2mg
参考答案:C
解析:乌头碱的致死量为2~4mg。故答案是C。
According to the job advertisement, ________ will be given to the candidates with working experience.
A.presentation
B.profession
C.preference
D.protection
事故是违背人的意志而发生的意外事件。