问题
填空题
如图所示，两个正立方体金属块A 、B放在水平地面上，若A、B对地面的压强相等，且边长之比l1：l2 = 2 : 3 ，则金属块A 与金属块B的密度之比为__________________。
答案
3﹕2
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如图所示，两个正立方体金属块A 、B放在水平地面上，若A、B对地面的压强相等，且边长之比l1：l2 = 2 : 3 ，则金属块A 与金属块B的密度之比为__________________。
3﹕2
根据短文内容，用方框中所给单词的适当形式填空。每词限用一次。
Drink at ___2____8 glasses of water a day. You may need even more water if you are exercising. Breakfast is the most important meal of the day. You will have more energy after eating breakfast. Eat a light lunch every day. If you don’t have time to go out, take a sandwich in the morning with you for a __3______ lunch. We should eat fruit and vegetables every day. Add a banana to your breakfast, have a salad with lunch, and eat at least one vegetable for ___4____. Try to have dinner at least 3 hours before you go to bed. Your body needs time to digest most of the food before you rest__5____the next 8 hours. |