Giúp tớ đi mn Cho mạch điện như hình vẽ, biết R1=20 ôm, R2=6Ω, R3=7Ω, R4=12 Ω, R5=9Ω. A) Xác định điện trở tương đương trong 2 trường hợp K mở và K đóng. B) Khi K đóng cường độ dòng điện qua R1 là 1,5A. Tính hiệu điện thế giữa hai đầu đoạn AB và CĐDĐ qua mạch chính và qua các điện trở?

tính chất của điệu thức thứ tự nhiên?

Hãy viết đoạn văn ngắn nêu suy nghĩ của em về công lao cha mẹ và nêu tránh nhiệm bổn phận của em với cha mẹ.

During the (31) ________ years, many young people can at times be difficult to talk to. They often seem to dislike being questioned. They may seem (32) _______ to talk about their work at school. This is a normal (33) _______ of this age. Though it can be very hard for parents to understand, it is part of becoming (34) ________ of teenagers trying to be adult while they are still growing up. Young people are usually unwilling to talk if they believe, that questions are trying to (35) ________ up on them Parents should do their (36) _______ to talk to their son and daughter about school, work and future plans but should not (37) ________ them to talk if they don't want to. Parents should also watch for danger signs. Some young people in trying to be adult may (38) ________ with sex, drugs, alcohol or smoking. Parents need to watch for any signs of (39) ________ behavior which may be connected with these and help if (40) ________. 31. a. early b. teenage c. childhood d. recent 32. a. unworried b. unrestrained c. unexpected d. unwilling 33. a. development. b. appearance c. circumstance d. achievement 34. a. free b. confident c. dependent d. independent 35. a. catch b. check c. keep d. make 36. a. well b. good c. better d. best 37. a. push b. allow c. put d. expect 38. a. experiment b. approach c. experience d. attach 39. a. unacceptable b. unusual c. normal d. exemplary 40. a. proper b. appropriate c. important d. necessary

Fill in the gaps with “yet, ago, ever, last night, for or since” 1. My father went to Italy five days ______. 2. He has known her _______ 2001. 3. Have you _________ seen an elephant? 4. She hasn’t finished her work ________. 5. He has lived in Madrid _______ ten years. 6. We went to bed at 11 o’clock ________.

Có hỗn hợp hai khí CO và CO2. Nêu phương pháp hóâ học để chứng minh sự có mặt của hai khí đó. Viết các phương trình hóa học.

if/it not/rain /he/pick/her/up/9a.m he/interested/listen/music minh/spend/thirty minutes/day/practicing/the piano

During the (31) ________ years, many young people can at times be difficult to talk to. They often seem to dislike being questioned. They may seem (32) _______ to talk about their work at school. This is a normal (33) _______ of this age. Though it can be very hard for parents to understand, it is part of becoming (34) ________ of teenagers trying to be adult while they are still growing up. Young people are usually unwilling to talk if they believe, that questions are trying to (35) ________ up on them Parents should do their (36) _______ to talk to their son and daughter about school, work and future plans but should not (37) ________ them to talk if they don't want to. Parents should also watch for danger signs. Some young people in trying to be adult may (38) ________ with sex, drugs, alcohol or smoking. Parents need to watch for any signs of (39) ________ behavior which may be connected with these and help if (40) ________. 31. a. early b. teenage c. childhood d. recent 32. a. unworried b. unrestrained c. unexpected d. unwilling 33. a. development. b. appearance c. circumstance d. achievement 34. a. free b. confident c. dependent d. independent 35. a. catch b. check c. keep d. make 36. a. well b. good c. better d. best 37. a. push b. allow c. put d. expect 38. a. experiment b. approach c. experience d. attach 39. a. unacceptable b. unusual c. normal d. exemplary 40. a. proper b. appropriate c. important d. necessary

During the (31) ________ years, many young people can at times be difficult to talk to. They often seem to dislike being questioned. They may seem (32) _______ to talk about their work at school. This is a normal (33) _______ of this age. Though it can be very hard for parents to understand, it is part of becoming (34) ________ of teenagers trying to be adult while they are still growing up. Young people are usually unwilling to talk if they believe, that questions are trying to (35) ________ up on them Parents should do their (36) _______ to talk to their son and daughter about school, work and future plans but should not (37) ________ them to talk if they don't want to. Parents should also watch for danger signs. Some young people in trying to be adult may (38) ________ with sex, drugs, alcohol or smoking. Parents need to watch for any signs of (39) ________ behavior which may be connected with these and help if (40) ________. 31. a. early b. teenage c. childhood d. recent 32. a. unworried b. unrestrained c. unexpected d. unwilling 33. a. development. b. appearance c. circumstance d. achievement 34. a. free b. confident c. dependent d. independent 35. a. catch b. check c. keep d. make 36. a. well b. good c. better d. best 37. a. push b. allow c. put d. expect 38. a. experiment b. approach c. experience d. attach 39. a. unacceptable b. unusual c. normal d. exemplary 40. a. proper b. appropriate c. important d. necessary

During the (31) ________ years, many young people can at times be difficult to talk to. They often seem to dislike being questioned. They may seem (32) _______ to talk about their work at school. This is a normal (33) _______ of this age. Though it can be very hard for parents to understand, it is part of becoming (34) ________ of teenagers trying to be adult while they are still growing up. Young people are usually unwilling to talk if they believe, that questions are trying to (35) ________ up on them Parents should do their (36) _______ to talk to their son and daughter about school, work and future plans but should not (37) ________ them to talk if they don't want to. Parents should also watch for danger signs. Some young people in trying to be adult may (38) ________ with sex, drugs, alcohol or smoking. Parents need to watch for any signs of (39) ________ behavior which may be connected with these and help if (40) ________. 31. a. early b. teenage c. childhood d. recent 32. a. unworried b. unrestrained c. unexpected d. unwilling 33. a. development. b. appearance c. circumstance d. achievement 34. a. free b. confident c. dependent d. independent 35. a. catch b. check c. keep d. make 36. a. well b. good c. better d. best 37. a. push b. allow c. put d. expect 38. a. experiment b. approach c. experience d. attach 39. a. unacceptable b. unusual c. normal d. exemplary 40. a. proper b. appropriate c. important d. necessary