Các máy cơ đơn giản A: lợi cả về lực và đường đi B: chỉ có lợi về lực. C: luôn bị thiệt về đường đi D: không cho lợi về công

Các câu hỏi liên quan

Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. 1. What do people do _________ a living in your village?_ They plant rice and vegetables. A. to B. with C. of D. for 2. The restaurant has the ______ for serving some of the finest food. A. repute B. reputed C. reputable D. reputation 3. A stranger nearby is better than a far away _________. A. relative B. friend C. parents D. neighbour 4. I had _________ to the countryside last month. A. a two-days trip B. a two-day trip C. two-day trip D. two-days trip 5. If he ____________ hard, he will fail the final exam. A. doesn’t work B. didn’t work C. won’t work D. not work 6. My grandma is a ______________ woman. She always cares about how we feel. A. tolerant B. obedient C. confident D. sympathetic 7. My son sometimes forgets _________ the stove when he has finished cooking. A. turning off B. turned off C. turn off D. to turn off 8. He came _________ some of his old love letters in his wife's desk. A. in B. on C. across D. up with 9. Hoa wanted to knit a scarf, but she ____________ of wool. A. went out B. ran out C. brought out D. grew out 10. He wore dark glasses _________ avoid being recognized. A. in order to B. so that C. so as D. in order that 11. On Sunday we decided to go to ______ beach by _______ train, but because of _______ bad weather, we went to ______ cinema instead. A. a - a - the – the B. a - X - a - the C. the - X - the - the D. the - the - a - X 12. My uncle _________ Paris two or three times. A. has visited B. is visiting C. was visiting D. often visits