不属于突发公共卫生事件的是
A. 重大传染病疫情
B. 群体性不明原因疾病
C. 重大食物中毒
D. 个别医疗伤亡
E. 重大职业中毒
氨基酸在等电点时
A. 不带负电荷
B. 在电场中不泳动
C. 带正电荷
D. 不带正电荷
E. 以上都正确
由副溶血性弧菌引起的中毒食物为
A. 海产品
B. 蔬菜
C. 淡水产品
D. 饼干
E. 面包
We can learn from the last paragraph that______.
A. it is necessary to obtain as much
B. people should make the best use of the information
C. we should realize the importance of accumulating information
D. it is of vital importance to acquire needed information efficiently