【简答题】乙酸乙酯是重要的化工原料。实验室合成乙酸乙酯的装置如下图所示。 有关数据及副反应: 副反应: C 2 H 5 OH+C 2 H 5 OH C 2 H 5 OC 2 H 5 +H 2 O 请回答下列问题: (1)在大试管A中添加的试剂有6 mL乙醇、4 mL乙酸和4 mL浓硫酸,这三种试剂的添加顺序依次为 _______、_______ 、_______ (2)试管B中导管接近液面未伸入液面下的...
【单选题】听力原文: Right up to the 19th Century, Oxford and Cambridge were the only two universities in England. Royal patronage and aristocratic money confirmed them in their position, and attempts to found new u...
A.
Because the Parliament only supported Oxford and Cambridge.
B.
Because only Oxford and Cambridge were supported by royal patronage and aristocratic money.
C.
Because Oxford and Cambridge were the most important cities in England.
D.
Because there were not enough students to be enrolled in more than two universities.