Một vật rắn nổi trên bề mặt một chất lỏng khi A: khối lượng của vật lớn hơn khối lượng của chất lỏng. B: khối lượng riêng của vật nhỏ hơn khối lượng riêng của chất lỏng. C: khối lượng riêng của chất lỏng nhỏ hơn khối lượng riêng của vật. D: khối lượng của chất lỏng lớn hơn khối lượng của vật.

Các câu hỏi liên quan

I. Choose the correct option for each gap in the sentences. 7. This shirt is much prettier, but it costs _____the other one. * A.so much as B.as many as C.twice as many D.twice as much as 1. I got up late, _____ I didn’t have time for breakfast. * A.because B.so C.as D.although 2. If you listen to the teacher attentively, you _____ how to do this exercise. * A.understood B.will understand C.would understand D.are understand 4. _____ he wasn’t invited, he went to the party. * A.s B.ecause C.So D.Although 8. Don’t worry about her _____. * A.complanation B.complaination C.complaint D.complaintment 9. What would you like to eat for lunch? - _____, I don’t mind. * A.Anything B.Every thing C.Nothing D.Something 6. They warned us _____ to the seaside in that month. * A.not to go B.not to going C,not go D.to not go 10. If today _____ Sunday, we’d have a day off. * A.will be B.isn't C.is D.were 3. My mother told me _____ so much noise at night. A.to not make B.making not C.not to make D.not making 5. Several important methods were _____ for preserving food in the nineteenth century. * A.covered B.seen C.invented D.prepared II. Give the correct form of the words in the brackets. 17. It is _____ to eat too much sugar. (HEALTH) 11. These shoes look quite smart but they’re terribly _____. (COMFORT) * 12. Switzerland and Australia are both _____ countries. (MOUNTAIN) * 14. Women nowadays have more _____to participate in social activities. (FREE) * 18. There are many cultural _____between his country and mine. (DIFFER) * 19. My brother often does experiments about electricity for _____ (PLEASE) * 16. You must make a quick _____ about who wins the contest. (DECIDE) * 20. The train made a late _____. (DEPART) * 13. I’ll always remember that journey. It was an _____ experience. (FORGET) * 15. Television is one of the cheapest forms of _____ . (ENTERTAIN)