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【多选题】
粗苯乙烯精馏不采用顺序分离流程，而是首先将苯乙烯从塔釜分离出来的理由是A.
该流程对乙苯和苯乙烯的分离效果比顺序分离流程好
B.
该流程对苯和甲苯的分离效果比顺序分离流程好
C.
该流程可使苯乙烯在流程中滞留时间缩短，减少聚合
D.
该流程可以使不涉及苯乙烯的塔分离操作在常压下进行，可降低操作费用和难度
E.
该流程分离出的苯乙烯纯度高
F.
该流程对乙苯的分离效果比顺序分离流程好
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【简答题】各种会计核算程序的主要区别在于____ 的依据不同 。
【单选题】High school students continue to work hard, _______ they often complain about great burdens and pressures in their life.
A.
as if
B.
as long as
C.
unless
D.
even though
【单选题】In the second study， students with low GPAs did NOT complain of 查看材料
A.
having trouble falling asleep
B.
waking at night and having trouble falling back to sleep
C.
having difficulty concentrating during the day
D.
being kicked in the leg at night
【单选题】Students continue to eat in school canteen______ they complain the quality of the food .
A.
as though
B.
even though
C.
as long as
D.
unless
【简答题】高压汞荧光灯是一种气体（）的电光源。
【单选题】What is more difficult for students when learning to complain?
A.
The linguistic part of the complaining.
B.
The cultural behavior. of being straightforward.
C.
Taking the products back to the stores.
D.
Understanding the refund policy of the stores.
【单选题】More and more students _________ too much homework and they are really tired of it.
A.
complain about
B.
care about
C.
learn about
D.
hear about
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