logo - 刷刷题
下载APP
【多选题】

( )属于正温度系数杀虫剂。

A.
DDT
B.
毒死蜱
C.
六六六
D.
茚虫威
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】负温度系数电阻的阻值随温度变化的规律是 ( ) 。

A.
温度升高 , 阻值增加
B.
温度升高阻值变化不大
C.
温度升高 , 阻值减小

【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】下列哪类农药属于负温度系数的农药()。

A.
有机磷
B.
氨基甲酸酯
C.
拟除虫菊酯
D.
苯氧羧酸