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【简答题】

气雾杀虫剂中的杀虫有效成分由哪两大类复配而成?

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参考解析:
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举一反三

【单选题】Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food.Fergus Clydesdale, head of the department of food science and nutrition at the University of Massac...

A.
They overlook the risks of the food they eat.
B.
They overestimate the hazards of their food.
C.
They are overoptimistic about the safety of their food.
D.
They overstate the government's interference with the food industry.

【单选题】中药最早的杀虫方法是()

A.
氯化苦熏蒸法
B.
环氧乙烷熏蒸法
C.
硫黄熏蒸法
D.
过氧醋酸熏蒸
E.
醋酸钠喷洒