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【简答题】
如图，一系列“黑色梯形”是由x轴、直线y＝ x和过x轴上的正奇数1、3、5、7、9、…所对应的点且与y轴平行的直线围成的．从左到右，将其面积依次记为S 1 、S 2 、S 3 、…、S n 、…．则S 1 ＝____ ____，S n ＝____ ____．
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反馈参考答案：
举一反三
【单选题】-In this day and age,women can have children and jobs as well. -I can't agree more.lt's great to have the two _____. [ ]
A.
linked
B.
related
C.
connected
D.
combined
【单选题】---Can I get you a drink? ---_______. But I have already got one.
A.
That's very nice of you
B.
No, you don't have to
C.
Yes, please
D.
With pleasure
【单选题】—_____ —I have a tooth ache. [ ]
A.
Can I help you?
B.
What's wrong?
C.
What do you have?
【单选题】---What’s the matter with you? ---______.
A.
I’m glad
B.
I have a cold
C.
I have something to do
D.
I can
【多选题】关于多组份混合物精馏分离过程的规划，哪些选项是正确的？
A.
精馏流程安排时，塔顶馏出液和塔釜液流量应该大致相当
B.
腐蚀性、易聚合或结垢的组分先分离
C.
高纯度 、 高回收率的组分先行分离
D.
含量多的组分先 分离
【多选题】关于多组份混合物精馏分离过程的规划，哪些选项是正确的？
A.
精馏流程安排时，塔顶馏出液和塔釜液流量应该大致相当
B.
腐蚀性、易聚合或结垢的组分先分离 (
C.
含量多的组分先分离
D.
高纯度、高回收率的组分先行分离
【单选题】—Can I have this seat? —Sorry, I'm _____ you can't. It's our teacher's. [ ]
A.
think
B.
thinking
C.
know
D.
afraid
【单选题】—Can you come to have lunch tomorrow? —______. I will arrive on time. [ ]
A.
That’s nothing
B.
That’s it
C.
That’s cool
D.
That’s the problem
【单选题】I can't go — for one thing, I have no money, and ______ , I have too much work.
A.
what's more
B.
as well
C.
for another
D.
in addition
【多选题】关于多组份混合物精馏分离过程的规划，哪些选项是正确的？
A.
精馏流程安排时，塔顶馏出液和塔釜液流量应该大致相当
B.
腐蚀性、易聚合或结垢的组分先分离
C.
高纯度，高回收率的组分先行分离
D.
含量多的组分先离
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