题目内容
当今时代知识更新周期大大缩短，如果不主动加快知识更新、优化知识结构、拓宽眼界和视野，那就难以增强本领，也就没有办法赢得主动、赢得优势、赢得未来。
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Since 1994, the United States Food and Drug Administration and the Department of Agriculture have required nearly all food to carry a foodindicating the amounts of calories, , protein, fat, and fiber perto make it easy for consumers to make healthful choices.
In an effort to provide additional guidance and reduce the incidence of diet-related cancers, the National Cancer Institute developed the 5-a-Day Campaign for Better Health, a program that the practice of eating five servings of fruits and vegetables daily. Studies of populations that eat many fruits and vegetables a decreased incidence of diet-related cancers. Laboratory studies have shown that many fruits and vegetables contain phytochemicals,that appear to the growth of cancer cells.
斜度是指一直线或平面对另一直线或平面的倾斜程度，其大小用倾斜角的（）值来表示。
用圆弧光滑连接两已知线段成为圆弧连接，其连接形式主要以下哪几种？
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