下列措施最有可能应用于绿色食品生产的是（  ）

一个图钉帽的面积是0.8cm²，图顶尖的面积是5×10^﹣4cm²，手指对图钉帽的压力是10N，手对图钉帽的压强是____，图顶尖对墙的压强是____．

根据短文内容，选择正确答案。
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    Many parents today worry about their children's diets. Then what is a healthy diet for children? Miss Jones from Happy Children Hospital gives the following advice:
    ◆Children shouldn't eat food with too much salt, because it can cause high blood pressure(高血压).
    ◆Children should eat food with less fat, oil and sugar. They should not eat too much junk food.
    ◆Fruit and vegetables are rich in vitamins(维生素). Children need to eat fruit and vegetables often.
    ◆Water is important to everyone. Children need to drink enough water every day.
    ◆Children need to eat breakfast every day. It is good for their bodies and minds.

有一组互不全等的三角形，它们的边长均为整数，每个三角形有两条边的长分别为5和7．

将一副直角三角尺如图放置，若∠AOD=20°，求∠COB的大小．

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