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datly12122005
2 năm trước
Hai vệ tinh nhân tạo 1 và 2 đang bay quanh trái đất trên quỹ đạo tròn bán kính lần lượt r và 2r. Tốc độ của vệ tinh 1 là V1. Tốc độ của vệ tinh 2 bằng bao nhiêu?
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Complete each of the following sentences so that it means the same as the sentence before it 1.I don't have a spare ticket.I can't take you to concert -->If I................................................................................. 2.They don't understand the problem.They won't find a solution -->If they................................................................ 3.He sits around too much.He isn't fit -->If he............................................................................ 4.She's very thin;perhaps that's why she feels cold so much -->If she........................................................................... 5.He never polishes his shoes, so he never looks smart -->If he...................................................................... 6. He can' t park near his office; that' s why he doesn' t come by car --> If he......................................................................... 7.My house is guarded by two big dog. That 's the only reason it isn' t broken into every night --> If my house............................................................................ 8.I don't know her email address,so I can't tell you -->If I...................................................................................... 9.She works in the evening. She has no time to play with her children --> If she..................................................................................... 10.I don't want them to be upset, so I've decided not to tell them what happened -->They................................................................................. 11.He doesn't see signal so he doesn't stop his car -->If he................................................................................... 12.Peter gets bad marks because he doesn't prepare his lessons well -->If Peter..................................................................................... 13.Mary doesn't have enough money.She can't buy new car -->If Mary.................................................................................... 14.Go right now or you'll be late for the train -->If you............................................................................... 15.He doesn't apply for the job because he doesn't have enough qualifications -->If he....................................................................................... 16.Hurry up,or we will be late for the exam --> If we....................................................................................... 17.They do not understand you because you do not often talk to them -->If you....................................................................................... 18.Because you speak English unnaturally,they do not understand you -->If you............................................................................................. các cậu giúp mình làm mấy câu này với! cảm ơn nhiều

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