-CHO

[单选题]官能团-CHO叫做（）A . 羧基B . 酮基C . 醛基

[单选题]D．irections: Read the following text. Choose the best word(s) for each numbered blank and mark A ,B, C or D on ANSWER SHEET I . ( 10 points)In the United States, the first day-nursery was opened in 1854. Nurseries were established in various areas du

[单选题]D．irections: Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on ANSWER SHEET I. ( 10 points)D．igital photography is still new enough that most of us have yet to form. an opinion about it, (1) develop a

[单选题]CHO助剂能提高汽油的（）。A . 干点B . 闪点C . 辛烷值D . 收率

[单选题]25． Which of the following about Jay Chou is NOT true?A． He was born on January 8,1979．B． He has a lot of fans．C． He hardly ever smiles．D． His songs are different from others．

90.下列各组费歌尔投影式中,两个投影式相同的是 ()-|||-COOH COOH CHO CHO-|||-

As the small airplane ascended into the ___skies, the passengers clung tightly t

[单选题]ArSO2NHOH+CH3CHO→（）+ArSO2H。A . CH3NH2B . CH3NHOHC . CH3COOHD . CH3CONHOH

[单选题]醛的通式为A．R-COOHB．Ar-COOHC．R-CHOD．R-CHO和Ar-COHE．R-COOH和Ar-COOH

CH3CH2CH(CH3)CHO 的名称A. 丁醛B. 3- 甲基丁醛C. 2- 甲基 -1- 丁酸醛D. 2- 甲基丁醛