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kakaka2k2
2 năm trước
em hãy so sánh sựu khác biệt của nguyên tử và phân tử.hãy tính nguyên tử khối và phân tử khối của các ví dụ sau: nguyên tử oxi ,nguyên tử canxi ,phân tử nước,phân tử canxi cacbonat
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If you are going (1) ______ a school camping trip, you will need a strong, well-made tent, and a warm sleeping bag. For cooking you will need a stove, and some simple cooking utensils such (2) ______ a kettle, a frying-pan and a saucepan, as well as a tin-opener. You will need paraffin for your stove, a bucket for (3) ______ water and a wash bowl. You should also be (4) ______ to take a safety lamp, some matches and a length of rope for securing things. For yourself you should have (5) ______ warm sweater, jeans and really comfortable shoes or boots, (6) ______ a complete change of all clothing in case you (7) ______ soaked. Besides toilet things, towel and swim suit, you should as (8) ______ take eating utensils, a small first-aid kit, a knife, some scissors and a needle and some thread, also a good torch (9)______ night time. Food stores should include instant coffee, teabags, sugar, salt, ketchup, dried milk, soup, tinned meat, vegetables, biscuits and baked beans. Perishables can be bought (10) ______. 1. A. on B. in C. over D. about 2. A. just B. only C. as D. like 3. A. putting B. carrying C. pouring D. having 4. A. special B. possible C. confident D. sure 5. A. a B. any C. the D. some 6. A. so B. too C. also D. such 7. A. take B. get C. have D. make 8. A. also B. so C. either D. well 9. A. for B. at C. with D. against 10. A. local B. locality C. localities D. locally

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