问题 问答题 简答题

简述传统四大印刷方式的印刷特点。

答案

参考答案:

使用平版印刷;应用水墨互斥原理印刷;印刷时用胶皮滚筒转印,是一种间接印刷;印版上的图文可做成正向;墨层薄,适合书刊报纸的印刷。

使用凹版印刷;可用墨层厚度的不同来表现图像的浓淡;印版耐印力高,大批量印刷时成本低,但制作周期长,污染大;印刷速度快;墨层较厚,适合包装、有价证券等的印刷。

丝网印刷的印版上,印刷部分是由大小不同的或是由大小相同但单位面积内数量不等的网眼组成。印刷时油墨涂刷在印版上,承印物放在印版下,通过在版面上刮墨透过孔洞,转移到承印物上形成印刷品。丝网印刷墨层厚实,立体感强;不受承印物形状、面积、位置限制;承印物范围广。

使用凸版印刷可使用水性油墨,有利于环保;适合包装印刷,刚性凸版印刷墨路长,印品有明显的压印痕迹。

选择题
单项选择题

Trying to get Americans to eat a healthy diet is a frustrating business. Even the best-designed public-health campaigns cannot seem to compete with the tempting flavors of the snack-food and fast-food industries and their fat-and sugar-laden products. The results are apparent on a walk down any American street—more than 60% of Americans are overweight, and a full quarter of them are overweight to the point of obesity.

Now, health advocates say, an ill-conceived redesign has taken one of the more successful public-health campaigns—the Food Guide Pyramid—and rendered it confusing to the point of uselessness. Some of these critics worry that America’s Department of Agriculture caved in to pressure from parts of the food industry anxious to protect their products.

The Food Guide Pyramid was a graphic which emphasizes that a healthy diet is built on a base of grains, vegetables and fruits, followed by ever-decreasing amounts of dairy products. meat, sweets and oils. The agriculture department launched the pyramid in 1992 to replace its previous program, which was centered on the idea of four basic food groups. The "Basic Four" campaign showed a plate divided into quarters, and seemed to imply that meat and dairy products should make up half of a healthy diet, with grains, fruits and vegetables making up the other half. It was replaced only over the strenuous objections of the meat and dairy industries.

The old pyramid was undoubtedly imperfect. It failed to distinguish between a doughnut and a whole-grain roll, or a hamburger and a skinless chicken breast, and it did not make clear exactly how much of each foodstuff to eat. It did, however, manage to convey the basic idea of proper proportions in an easily understanable way. The new pyramid, called" My Pyramid", abandons the effort to provide this information. Instead, it has been simplified to a mere logo. The food groups are replaced with unlabelled, multi-colored vertical stripes which, in some versions, rise out of a cartoon jumble of foods that look like the aftermath of a riot at a grocery store. Anyone who wants to see how this translates into a healthy diet is invited to go to a website, put in their age, Sex and activity level, and get a Custom. designed pyramid, complete with healthy food choices and suggested portion sizes. This is fine for those who are motivated, but might prove too much effort for those who most need such information.

Admittedly, the designers of the new pyramid had a tough job to do. They were supposed to condense the advice in the 84-page United States’ Dietary Guidelines into a simple, meaningful graphic suitable for printing on the back of a cereal box. And they had to do this in the face of pressure from dozens of special interest groups—from the country’s Potato, Board, which thought potatoes would look nice in the picture, to the Almond Board of California, which felt the same way about almonds. Even the National Watermelon Promotion Board and the California Avocado Commission were eager to sect heir products recognized.

Nevertheless, many health advocates believe the new graphic is a missed opportunity. Although officials insist industry pressure had nothing to do with: the eventual design, some critics suspect that political influence was at work: On the other hand, it is not clear how much good even the best graphic could do. Surveys found that 80% of Americans recognized the old Food Guide Pyramid—a big success in the world of public, health campaigns. Yet only 16% followed its advice.

Which of the following is NOT TRUE about the Food Guide Pyramid in 1992()

A. It stresses the value of grains, vegetables and fruits

B. It places emphasis on the four basic food groups

C. It rejects higher proportion of meat, sweets and oils

D. It met objections from meat and dairy industries