"Dream high" is a Korea drama series broadcast in 2011.It is a school film. It is about six students at Kirin Art High School work to achieve their dreams of becoming stars.It is made by KBS.It is written by Park Hye Ryun. The main character: Song Sam Dong, Hyun Si Hyuk, Go Hye Mi ,Yoon Baek Hee . Kim Pil Suk , Jason .Song Sam Dong is a country bumpkin who follows Hye Mi to Seoul after much convincing. He is a musical genius, but he is naive and has a hearing problem. Sam Dong is in love with Hye Mi,he defends her when her schoolmates turn on her, but starts to regret it all that he has done for her when he realizes Hye Mi has feelings for Jin Guk. Jin Guk is a childhood friend of Go Hye Mi and he constantly tries to help and save her. He mainly excels at dancing. He is in a love triangle with Go Hye Mi and Yoon Baek Hee. Because he performed with Baek Hee at the Showcase he has debuted with one of the top agencies. Go Hye Mi is the main character of this drama. In the beginning of this story she is portrayed as a cold-hearted girl who ditches her best friend, Yoon Baek Hee, to attend Kirin High Art School. Ironically, she is not accepted until later as one of the director's special students. Throughout the story she becomes nicer and expresses her feelings more. After being hurt by Go Hye Mi's harsh actions, she tries to get revenge on Hye Mi by becoming her greatest competitor. She is shaken when she realizes Go Hye Mi doesn't care about the competition anymore and just wants to be friends. She also has a crush on Jin Guk and is jealous that he likes Hye Mi. She becomes friends with Hye Mi again later on. She is a girl with an unfortunately fat appearance, but a beautiful voice. She has a major crush on Jason who rejected her. She promised that in 200 days she would lose 30kg while the time he is away from doing K activities. Later in 200 days she loses 30kg, and Jason is attracted to the new, slimmer, Pil Suk. They soon express their feelings for each otherJason is an American exchange student who excels mainly in dancing. He has good manners, but doesn't show much spirit. He does not like Pil Suk as much as she likes him in the beginning but after his debut, their relationship is unclear. According to Pil Suk, he has no goals in life. Through out the drama he starts to like Pil-Suk. the film has a happy ending 

Giao thoa sóng trên mặt nước với hai nguồn sóng tại A và B có phương trình lần lượt là u A = A cos   100 πt ;  u B = A cos   100 πt  Một điểm M trên mặt nước (MA = 3 cm, MB = 4 cm) nằm trên cực tiểu giữa M và đường trung trực của AB có hai cực đại. Tốc độ truyền sóng trên mặt nước bằng:

A. 20 cm/s.                      

B. 25 cm/s.                

C. 33,3 cm/s.         

D. 16,7 cm/s.

Hợp chất hữu cơ X chứa một loại nhóm chức có công thức phân tử C₈H₁₄O₄. Khi đun nóng X trong dung dịch NaOH được một muối và hỗn hợp hai ancol Y, Z. Phân tử ancol Z có số nguyên tử cacbon nhiều gấp đôi số nguyên tử cacbon trong phân tử ancol Y. Khi đun nóng với H₂SO₄ đặc, Y cho một olefin, Z cho hai olefin đồng phân cấu tạo. Công thức cấu tạo của X là:

A. CH₃OOCCH₂CH₂COOC₃H₇.

B. C₂H₅ OOC-COO[CH₂]₃CH₃.

C. C₂H₅OOCCH₂COOCH(CH₃)₂.

D. C₂H₅OOC-COOCH(CH₃)C₂H₅.

nhân hóa 

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Chất X có công thức: CH₃COOC₂H₅. Tên gọi của X là

A. vinyl propioat

B. vinyl axetat

C. etyl axetat

D. etyl propioat

Thí nghiệm nào sau đây khi kết thúc phản ứng thu được kết tủa?

A. Cho dung dịch NaOH đến dư vào dung dịch AlCl₃

B. Sục khí CO₂ đến dư vào dung dịch Ba(OH)₂

C. Đổ dung dịch H₃PO₄ vào dung dịch AgNO₃

D. Cho dung dịch NaOH vào dung dịch Ca(HCO₃)₂

Cho dãy các chất sau: Al, Na₂CO₃; Al(OH)₃; (NH₄)₂CO₃. Số chất trong dãy trên vừa tác dụng được với dung dịch HCl, vừa tác dụng được với dung dịch NaOH là

A. 3

B. 2

C. 4

D. 1