问题
选择题
连通器广泛应用在日常生活、生产中。图中不是利用连通器原理的是
答案
答案：D
题目分析：上端开口，底部相连通的容器叫连通器，连通器内装同种液体，且液体不流动时，各容器中的液面相平，所以A、B、C都是连通器，D图中只有一个容器，不是连通器，而且密度计的原理是物体漂浮时，浮力等于重力。所以选择D。
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连通器广泛应用在日常生活、生产中。图中不是利用连通器原理的是
答案：D
题目分析：上端开口，底部相连通的容器叫连通器，连通器内装同种液体，且液体不流动时，各容器中的液面相平，所以A、B、C都是连通器，D图中只有一个容器，不是连通器，而且密度计的原理是物体漂浮时，浮力等于重力。所以选择D。
We all know that food gives us energy, but sometimes it can make us much happier when we feel bad. Studies show that foods such as sea fish, bananas, pumpkins and chicken can help fight against bad moods. How can they affect our moods? Studies show that people living by the sea appear much happier than other people, because the fresh sea air helps them clear their minds and they eat a lot of sea fish. Bananas have something that is full of Vitamin B6. Having more bananas can help us make a quick decision, and become more confident. Eating pumpkins can also help people get into a good mood because it’s rich in Vitamin B6 and iron(铁)and it will make us happier. Are you in a bad mood? If you are , don’t sit alone. Go to eat such happy food with your friends. Maybe you’ll be better. 小题1:Food gives us energy and sometimes .
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