Điều kiện để phản ứng hóa học xảy ra là

cho Δ ABC cân tại A, AB = AC = 5cm; BC = 6cm. kẻ AH ⊥ BC (H ∈ BC) a) chứng minh HB = HC b) tính AH c) kẻ HD ⊥ AB (D ∈ AB); HE ⊥ AC(E ∈ AC). CMR: Δ HDE là tam giác cân

Cho mình bài văn mẫu So sánh cái tôi trong bài thơ Vội vàng và bài thơ Tràng giang, có thể chép mạng nhưng đúng cho mình nha

II.Complete the sentences. Use the correct word in parentheses. 1.He felt sick……………he had eaten too much. ( because / so) 2.He didn’t study ………….he failed the test. ( because / so) 3.His car didn’t start ………….the battery was dead. ( because / therefore) 4.Solar energy is clean ………….almost endless.( and / but) 5.I sent her three letters,………………she didn’t reply. ( or / but) 6. I will tell you my plans…………….we are having dinner. ( while / or / because) 7.I enjoy learning English ………………I find it very difficult. ( but / so / or) 8.Her hobbies are watching TV……………….playing games. ( and / although / or) 9.The course was cancelled ……..There were very few students registering for it. ( so / because / but) 10. The weather was cold ; ……….. ,she wore a sweater.( so / therefore / because)

em hãy cho biết sự xuất hiện của nghề nông, chăn nuôi có tầm quan trọng to lớn. Em hãy liên hệ với thực tế hiện nay có gì khác Mk đang cần gấp ạ Xin các bn

giúp mk câu 2c nha mọi ng cả câu 4 nữa

II.Complete the sentences. Use the correct word in parentheses. 1.He felt sick……………he had eaten too much. ( because / so) 2.He didn’t study ………….he failed the test. ( because / so) 3.His car didn’t start ………….the battery was dead. ( because / therefore) 4.Solar energy is clean ………….almost endless.( and / but) 5.I sent her three letters,………………she didn’t reply. ( or / but) 6. I will tell you my plans…………….we are having dinner. ( while / or / because) 7.I enjoy learning English ………………I find it very difficult. ( but / so / or) 8.Her hobbies are watching TV……………….playing games. ( and / although / or) 9.The course was cancelled ……..There were very few students registering for it. ( so / because / but) 10. The weather was cold ; ……….. ,she wore a sweater.( so / therefore / because)

Phương trình hóa học dùng để

Put the verbs into the correct tense, past simple or present perfect. 1. _____________ (you/ ever/ be) to the United States ? - No, but I _____________ (be) to England and France. 2. When we were in Canada, we _____________ (go) skiing almost every day. 3. When _____________ (you/ meet) your wife? - 3 years ago. 4. Peter _____________ (not phone) yet. I’m still waiting. 5. I _____________ (know) Helen since we were at school together. 6. My uncle _____________ (live) in Berlin in 1999. 7. We _____________ (not see) Beth at Mike’s house yesterday morning. 8. Do you like this picture? My uncle _____________ (paint) it. 9. Mr. Dass _____________ (leave) for New York late last night. 10. Mr and Mrs Grey _____________ (teach) French here for over five years.

Phương trình hóa học dùng để