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【多选题】
设A是赋线性空间X的子集,则A是的充要条件是A.
A不是开集
B.
C.
D.
A是X的有限维子空间
E.
A中任意收敛序列的极限都在A中
F.
A中任意序列都在A中收敛
G.
A的所有接触点都在A中
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反馈参考答案：
举一反三
【单选题】A call option is:
A.
the right to sell at a specific price
B.
the right to buy at a specific price
C.
an obligation to buy at a certain price.
【单选题】Why do installers tend to work with large companies?
A.
Because it is more economically efficient.
B.
Because smaller companies are in the dark.
C.
Because large companies offer better prices.
D.
Because the government offers attractive incentives.
【简答题】Do you think movement of staff between companies is likely to increase in the future? (Why? / Why not?)
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