Khả năng dẫn điện của dung dịch thay đổi khi nào?

cách vẽ dồ thị y=sinx,đồ thị y=/sinx/,đồ thị y=sin/x/ vì sao hàm số y=sinx lại là hàm lẻ vì sao lại có T=2pi

bài 2 a và b ,,,,,,,,,,,,,,,,,,,,

làm bài 1 tính,,,,,,,,,,,,,,,,,,,,,

I. Choose the word which has a different sound in the part underlined. 1. A. sound B. touch C. down D. account 2. A. design B. preserve C. basic D. physical 3. A. occupation B. occasion C. shake D. miraculous 4. A. concerned B. received C. attached D. concealed 5. A. teacher B. clear C. reason D. mean 6. A. letter B. twelve C. person D. sentence 7. A. included B. received C. remembered D. annoyed 8. A. enough B. young C. country D. mountain 9. A. speech B. March C. machine D. children 10. A. face B. commercial C. center D. city

Ai biết làm ko ạ giúp em đii ạ cần gấp lắm

mọi người giúp em với ạ em đag cần gấp

III. Read the passage about introducing Vietnamese customs to foreigners, and then choose the best answer A, B, C or D. The Vietnamese are known to be polite, hospitable and sensitive. They have a casual and friendly (1) . They regard friendship as being very important throughout one’s life. They are always open to visits from friends. Drop-in visits are welcome. The Vietnamese are very (2) to their family. When they (3) you a gift, the Vietnamese will usually speak lightly about it. Even though it is an expensive gift, they may pretend it is of no great monetary value. (4) 4,000 years of civilization, the Vietnamese are proud people who like to recite to a myth that they are descendants of an angel and a dragon. If you happen to be in their homes at meal time, the Vietnamese will probably (5) you to sit down and share whatever food is (6) . Let them know that you enjoy their food is one way in successfully (7) a better relationship with them. When they invite you to their homes for a meal, celebration, or special occasion, some (8) - usually food, fruits, chocolate or liquors - should be offered to the host’s family. 1. A. tradition B. feature C. culture D. manner 2. A. closed B. closing C. close D. being closed 3. A. offer B. carry C. send D. sell 4. A. Of B. With C. At D. In 5. A. take B. require C. speak D. invite 6. A. good B. present C. available D. delicious 7. A. setting B. building C. taking D. being 8. A. gifts B. invitations C. offers D. situations

Các bạn giải nhanh giúp mình nha mình sẽ tặng các bạn 5 sao cảm ơn nhiều

15,6G K +900ml dd H2SO4 0,15M TÌM a)VH2(đktc) b)CM dd sau pứng