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2 năm trước
một bể cá dạng hình hộp chữ nhật có các kích thước ở trong lòng bể là 25cm,40cm,50cm.Hiện nay 1/4 thể tích của bể chứa nước.Hỏi cần phải đổ thêm vào bể bao nhiêu lít nước để 95%thể tích của bể có chứa nước? các bạn làm bài này giúp mình nha!chúc các bạn học giỏi
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The next generation of telephone users will probably laugh(1).... we explain how we used to stand next to a wall in the kitchen to (2) .... a phone call. Mobile communications, already highly advanced compared with a decade ago, will completely change communications in the next few years (3)......there are millions of people using mobile phones, most people know(4)....about the mobile telecommunications industry and its technology. there are three types of mobile phones. these are than portables, pocket-sized than portables, and transportable. the smallest and most popular are the pocket-sized hand portables. these work on rechargeable batteries, which allow an (5)..... of up to 80 min's conversation. mobiles that are fitted permanently in a vehicle do not (6) .... on separated batteries. they require an external aerial on the vehicle. this can mean a stronger signal with clearer (7)..... Transportables have a high power capability and can be used (8)....anywhere. They come with powerful battery packs for longer, continuous use and may also be put (9) .... a vehicle, using its electrics. They (10)..... to be bulkier than hand portables 1. A. unless B.when C. while D.whether 2. A. make B. give C. take D. do 3. A. In addition B. Because C. as a result D. Although 4. A. little B. some C. few D. lots 5. A. amount B. account C. activity D.insist 6. A. rely B. create C. carry D. insist 7. A. wave B. letter C. speech D. speed 8. A. mostly B. hardly C. most D. almost 9. on with B. into C. up with D. in to 10. A. used B.have C.tend D. are

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