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【多选题】

燃气涡轮发动机使用的燃料中加入防微生物的添加剂其作用是:().

A.
防止微生物积累,堵塞油滤和管路
B.
能杀死燃油箱中形成的废物微生物,但对细菌和真菌不起作用
C.
防止微生物腐蚀部件
D.
加入的防微生物添加剂越多效果越好
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【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】航空燃气涡轮发动机燃油系统的功用主要是:

A.
根据发动机状态和飞行状态调节燃油
B.
对发动机提供一定的保护
C.
对发动机进行冷却
D.
A和B

【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