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yagamiku123
2 năm trước
Giúp mình 1 câu trắc nghiệm này với mình hứa sẽ đánh giá 5 sao Cho các phát biểu sau: (a) hạt nhân của nguyên tử có Z notron thì ĐTHN là Z+. (b) số khối A của hạt nhân bằng tổng số hạt trong nhân. (c) mỗi nguyên tố hóa học chỉ có một giá trị số đơn vị ĐTHN. Nhóm các phát biểu đúng là A. (a), (b). B. (b), (c). C. (a), (c). D. (a), (b), (c).
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Các câu hỏi liên quan

EX 1 : Present perfect 1. We _________________(be) to the pagoda many times. 2. My sister ___________________ (go)out . 3. We ______________ (be)very busy lately. 4. Our present teacher ____________________ (live)in this city all of his life 5. I _____________________ (never/see) that television program 6. We _____________________ (fly) to Hanoi twice since last summer 7. John _______________________ (just/finish) his assignment 8. I _________________________(not/see) your brother recently 9. I’m very tired. I _____________________ (drive) this car since 7a.m 10. You ____________________ (just/meet)her – if you hurry, you will catch her in the street 11. This is the nicest restaurant I ________________ (see) 12. I ______________________ (write) three letters already 13. This is the fourth time he _________________________ (damage) my car 14. ______________________________ (you ever eat) Chinese food? 15. She’s got the best voice I ______________________ (ever hear) Ex 2 : Past simple 1. I (go)............................to Ben Thanh market last Monday 2. He (get)..............................up at 7 o’clock yesterday. 3. What time you (go) .....................to bed last night? 4. She ( not go)..................................to work last weekend. 5. Lan (meet).................................her at the party 3 years ago. 6. Last summer vacation, Mom (not buy).............................me a new buy? 7. When he (leave)............................... for work last week. 8. What you (do)................................. yesterday? 9. We (begin)....................................to learn English 3 years ago. 10. She (be).........................................an engineer last week.

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