【简答题】口服抗菌药利君沙的制备原料G和某种广泛应用于电子电器等领域的高分子化合物I的合成路线如下: (1)A的结构简式是______,A→B的反应类型是________,D中官能团的名称__________。 (2)写出E→F的反应方程式_______________。 (3)H的分子式为C 8 H 6 O 4 ,能与碳酸钠溶液反应放出气体,其一氯代物只有一种,写出E+H→I的反应方程式_________...
【简答题】以下各空,填写代表本题正确答案的字母(A\B\C\D) 1 Q: What is Emily going to do? 2 Q: What did Emily think life in Santa Fe would be like? 3 Q: What is unique in Santa Fe according to the man? 4 Q: What attracts artists a...
【简答题】Mom makes me eat an apple every day ________ healthy. A. keeps B. is kept C. to keep D. kept 2.After the students learnt the text "Hot Tips for August 2040", the teacher kept them ________________ wha...
【单选题】在HTML中, 中的method表示( )
【简答题】Section B Directions : There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You ...