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Yenyen
2 năm trước
Trình bày phương pháp để phân biệt các chất bột CaCO3 , NaHCO3 ,NaCl,
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Một thấu kính phân kì có tiêu cự 20cm. Vật sáng AB đặt thẳng góc với trục chính và cách thấu kính một đoạn OA = d = 30cm. Xác định vị trí, tính chất của ảnh tạo bởi TKPK. Tóm tắt ........................................... ........................................... ........................................... ........................................... ........................................... ........................................... ........................................... . Bài giải: ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................

Example: He/ She/ It (play) plays the guitar. 1) I (bake) …………………………….cakes. 2) You (work) …………………………….in an office. 3) We (take) …………………………….pictures of birds. 4) They (talk) …………………………….about cars. 5) He (think) …………………………….about school. 6) She (play) ……………………………. soccer. 7) It (rain) …………………………….here a lot. 8) I (like) …………………………….chocolate. 9) He (like) …………………………….chocolate. 10) You (watch) …………………………….movies. 11) She (watch) …………………………….movies. 12) The babies (cry) ……………………………. every night. 13) The baby (cry) …………………………….every night. 14) I (fly) …………………………….to Belize every year. 15) My father (fly) …………………………….to Belize every year. Exercise 9: Fill in the spaces with the correct form of the verb in simple present tense. Example: I (play) play the guitar. Example: Jessica (play) plays the guitar. 1) I (be) ____________________ sixteen years old. 2) Tommy (live) ___________________ at 107 Pine Lane. 3) Juana (cook) ______________________ dinner for her family. 4) They (eat) ________________________ lunch at 12:00. 5) Nina (take) ________________________ medicine when she is sick. 6) I (like) _________________________ chocolate. 7) He (drive) _______________________ a nice car. 8) We (want) _____________________ to see a movie tonight. 9) Mr. Anderson (teach) _____________________ chemistry at Hill High School. 10) They (study) ______________________ English at school. 11) I (want) ______________________ to go home now.

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