【单选题】分子式为C 5 H 12 O且可与金属钠反应放出氢气的有机化合物能被氧化成醛的同分异构体有(不考虑立体异构)( )
【简答题】句子翻译。阅读短文,翻译画线部分的句子。(共5小题,计l0分) Dear Knowledgeable, My best friend, Mei, has a problem. There is an important English speech contest for our whole town next month. 小题1: Our classmates want her to repr...
【单选题】We are _________ by doctors to eat more natural food and take plenty of physical exercise.
【简答题】American eat a lot of beef because there is plenty of land for raising cattle and their meat can be shipped cheaply for long distances by railroads.
【单选题】You should eat plenty of fruits, leafy vegetables and______cereals.
【单选题】分子式为C 5 H 12 O且可与金属钠反应放出氢气的有机化合物有(不考虑立体异构)
【单选题】分子式为C5H12O且可与金属钠反应放出氢气的有机化合物有(不考虑立体异构)
【单选题】分子式为C 5 H 12 O且不可与金属钠反应放出氢气的有机化合物有(不考虑立体异构)( )
【单选题】We are often _____ by the doctors to eat more healthy food and take plenty of physical exercise. [ ]