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【单选题】

四乙基铅曾用于汽油的添加剂,其作用是( )

A.
防腐剂
B.
防冻剂
C.
防爆剂
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参考答案:
参考解析:
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【单选题】电控汽油喷射发动机怠速控制阀的作用是()。

A.
冷启动
B.
测量进气量
C.
自动调整怠速
D.
海拔高度补偿器

【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】一般来说,汽油馏分中的环烷烃主要是()。

A.
单环环烷烃
B.
双环环烷烃
C.
三环环烷烃
D.
四环环烷烃

【单选题】近年来,我国许多城市禁止汽车使用含铅汽油,其主要原因是

A.
提高汽油燃烧效率
B.
降低汽油成本
C.
避免铅污染大气
D.
增强汽油的抗爆性

【多选题】下列属于食品添加剂的是()。

A.
防腐剂
B.
酸味剂
C.
漂白剂
D.
凝固剂