Amin nào sau đây có tên gốc-chức là sec-butylamin? 

A. CH₃CH₂CH(NH₂)CH₃

B. CH₃CH₂CH₂CH₂NH₂

C. CH₃CH(CH₃)CH₂NH₂.

D. (CH₃)₃CNH₂

Miss Hien has long black hair.

some

They are going to visit Yen Tu Pagoda on the way to Ha Noi next week.

1, She is a tall and thin women.

2,He is a strong weight lifter.

3,She is a light gymnast.

4, It is a short pencil.

5, She is a beautiful girl.

There are twenty two players in a football match

câu dưới mk sai, sorry