碱金属循环积聚给高炉生产带来什么害处？防治措施有哪些？

化学与生活、生产、社会密切相关。下列说法错误的是

A．在工业生产中，尽量使用纯液态有机物代替水作溶剂

B．垃圾是放错地方的资源，应分类回收利用

C．为了防止白色污染应提倡减少塑料袋的使用

D．绿色化学的核心是利用化学原理消除污染的产生

城市分区规划应当依据已经依法批准的( )进行编制。

A．城市区域规划

B．城镇体系规划

C．城市总体规划

D．城市行政区域划分

The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat ,it has, at the same time,made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats,and other food additives,caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes,but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration(FDA) has tried repeatedly to control these procedures, the practices continue.

What are nitrates used for?（）

A.They preserve flavor in packaged foods.

B.They preserve the color of meats.

C.They are the objects of research.

D.They cause the animals to become fatter.

最常用于确定与颈椎病有关的神经生理缺陷的检查是（）

A.放射平片

B.MRI

C.CT

D.EMG

E.SSEP／MEP

按在借贷期限内利率是否能变动来划分，利率可分为( )。

A．名义利率

B．实际利率

C．官方利率

D．固定利率

E．浮动利率