诊断有机磷中毒时,血胆碱酯酶活性应
A.<100%
B.≤90%
C.≤80%
D.≤70%
E.≤60%
参考答案:D
按风险影响范围分类可以将风险分为()。
A.纯风险和投机风险
B.政治风险、经济风险、技术风险和自然风险
C.可管理的风险和不可管理的风险
D.基本风险和特殊风险
Directions: Write an essay of 160-200 words based on the following drawing. In your essay, you should
1) describe the drawing,
2) interpret its meaning, and
3) give your comment on it.
You should write neatly on ANSWER SHEET 2.