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【单选题】很多国家已停止使用含铊的杀虫剂。元素周期表中铊的数据见右图，下列说法正确的是
A.
TI元素是一种主族元素
B.
TI元素的相对原子质量是204
C.
铊元素的质量数是204.4
D.
TI原子最外层有3个能量相同的电子
【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】Even plants can run a fever, especially when they’re under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3,000 feet away- straight up. A decade ago, ada...
A.
the lack of official support
B.
its high cost
C.
the lack of financial support
D.
its failure to help increase production
相关题目：
【判断题】本课程讲授者认为发明DDT作为杀虫剂获得诺奖是个失误
A.
正确
B.
错误
【单选题】不属于我国自主开发的杀虫剂是：
A.
杀虫双
B.
氯噻啉
C.
环氧虫啶
D.
丁虫腈
E.
氯氰菊酯
【单选题】根据其化学结构，敌敌畏属于有机磷杀虫剂中的（）类杀虫剂
A.
膦酸酯
B.
焦磷酸酯
C.
硫代磷酸酯
D.
磷酸酯
【单选题】很多国家已停止使用含铊的杀虫剂。元素周期表中铊的数据见右图，下列说法正确的是
A.
TI元素是一种主族元素
B.
TI元素的相对原子质量是204
C.
铊元素的质量数是204.4
D.
TI原子最外层有3个能量相同的电子
【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】下面杀虫剂属于蜕皮激素类似物的是
A.
除虫脲
B.
灭幼脲
C.
抑食肼
D.
吡丙醚
【判断题】拟除虫菊酯类杀虫剂具有高效、杀虫谱广、对人畜和环境较安全的特点。
A.
正确
B.
错误
【判断题】拟除虫菊酯类是近年来发展较快的杀虫剂,具有高效、低毒、低残留等特点。( )
A.
正确
B.
错误
【单选题】Even plants can run a fever, especially when they’re under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3,000 feet away- straight up. A decade ago, ada...
A.
the lack of official support
B.
its high cost
C.
the lack of financial support
D.
its failure to help increase production
【单选题】乐果属于有机磷杀虫剂分类中的()
A.
剧毒类
B.
高毒类
C.
中毒类
D.
低毒类
【判断题】卫生间每周要对地面喷洒杀虫剂一次，尤其注意对地漏处的喷洒。
A.
正确
B.
错误
【单选题】新烟碱类杀虫剂主要作用于
A.
乙酰胆碱酯酶
B.
丁酰胆碱酯酶
C.
烟碱乙酰胆碱受体
D.
几丁质合成酶
【单选题】通过特殊的行为，避免与杀虫剂接触或减少接触，称为（ ）。
A.
动作抗药性
B.
行为抗药性
C.
生理抗药性
D.
即时抗药性