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1,2 - 二溴乙烷可作汽油抗爆剂的添加剂，常温下它是无色液体，密度2．18 g·cm -3 ，沸点131．4℃，熔点 9．79℃，不溶于水，易溶于醇、醚、丙酮等有机溶剂。在实验室中可以用下图所示装置制备1,2-二溴乙烷。其中分液漏斗和烧瓶a中装有乙醇和浓硫酸的混合液，试管d中装有液溴(表面覆盖少量水)。填写下列空白 （1）写出本题中制备1,2-二溴乙烷的两个化学反应方程式 _______________________________ （2）b可以防止倒吸，并可以检查实验进行时试管d是否发生堵塞。请写出发生堵塞时瓶b中的现象____________________________。 （3）容器c中NaOH溶液的作用是__________________________________。 （4）某学生在做此实验时，使用一定量的液溴，当溴全部褪色时，所消耗乙醇和浓硫酸混合液的量，比正常情况下超过许多。如果装置的气密性没有问题，试分析其可能的原因（写出一条既可） ____________________________________
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【单选题】Theirs is a modern love drama. They met on the Internet and fell deeply in love with each other. They shared secrets, memories, feelings—even though they had never laid eyes on each other. And now, th...
A.
honesty
B.
dishonesty
C.
lies
D.
sympathy
【简答题】简述采购的分类。
【简答题】简述采购以及采购管理的分类。
【简答题】简述采购的类型。
【简答题】简述采购绩效评估的方法分类。
【单选题】Theirs is a modern love drama. They met on the Internet and fell deeply in love with each other. They shared secrets, memories, feelings—even though they had never laid eyes on each other. And now, th...
A.
Kevin had seen Marie before their marriage.
B.
Before their marriage Marie didn't know Kevin was online looking at some pornography sites.
C.
Had Kevin stopped looking online for pornography forever, he would not have been kept in the police station for three days.
D.
The relationship between Kevin and Marie as husband and wife will remain the same as before.
【单选题】Theirs is a modern love drama. They met on the Internet and fell deeply in love with each other. They shared secrets, memories, feelings—even though they had never laid eyes on each other. And now, th...
A.
appeared suddenly
B.
left quickly
C.
returned quickly
D.
moved quickly
【单选题】Theirs is a modern love drama. They met on the Internet and fell deeply in love with each other. They shared secrets, memories, feelings—even though they had never laid eyes on each other. And now, th...
A.
as a father
B.
as a husband
C.
as a security guard
D.
as an actor
【单选题】The advance in communications has brought ________ changes in the way people live.
A.
drama
B.
dramatic
C.
dramatist
【简答题】简述采购的类型种类。
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