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问题 单项选择题

日常生活中，使用烹调油时应注意的是（）

A.多选用植物油，少用或不用动物油

B.使用控油壶，限制用油量

C.少用油煎、油炸的烹调方法

D.以上都是

答案

参考答案：D

单项选择题

A


"In only six clays I lost seven pounds of weight. "
"Two full inches in the first three days!"
These are the kinds of statements used in magazine, newspaper, radio and television ads. , promising new shapes and new looks to those who buy the medicine or the device. The promoters of products say they can shape the legs, slim the face, smooth wrinkles, or in some other ways to add to beauty or desirability.
Often such products are nothing more than money-making things for their promoters. The results they produce are questionable, and some are dangerous to health.
To understand how these products can be legally promoted to the public, it is necessary to understand something of the laws covering their regulation. If the product is a drug, FDA (Food and Drug Administration)can require proof (证明) under the Food, Drug, and Cosmetic Act that is safe and effective before it is put on the market. But if the product is a device, FDA has no authority to require pre-marketing proof of safety or effectiveness. If a product already on the marker is a danger to health, FDA can request the producer or distributor to remove it from the market voluntarily, or it can take legal action, including seizure (查封) of the product.
One notable case a few years ago involved an electrical device called the Relaxacisor, which had been sold for reducing the waistline. The Relaxacisor produced electrical shocks to the body through contact pads. FDA took legal action against the distributor to stop the sale of the device on the grounds that it was dangerous to health and life.
Obviously, most of the devices on the market have never been the subject of court proceedings (法律诉讼), and new devices appear continually. Before buying, it is up to the consumer to judge the safety or effectiveness of such items.

FDA can ask for the proof of safety and effectiveness of a product ______.

A．if it is a drug

B．if it is a device

C．if its consumers make complaints

D．if its distributors challenge FDA’s authority
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单项选择题

对于非晶硒探测器的说法错误的是（）

A.X线影像转换成数字影像的过程中，没有可见光的产生

B.硒层的主要作用是接收X线的照射，产生电子一空穴对

C.在该平板探测器中，薄膜晶体管（TFT）起开关作用，每个TFT就是一个影像像素

D.TFT像素尺寸的大小，直接决定图像的分辨率

E.在平板探测器扫描电路未清除硒层中的潜影和电容上的电荷时，可以继续使用
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