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问题 名词解释

极性

答案

参考答案：

指植物的组织、器官甚至单个细胞在不同的轴向上存在的某种形态结构以及生理生化梯度的差异.极性是植物细胞分化的前提。

单项选择题 A1/A2型题

正常人腰穿CSF蛋白质总量为（）

A.650～750mg／L

B.550～650mg／L

C.350～550mg／L

D.400～450mg／L

E.150～450mg／L
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单项选择题

In October, James Knight owned stock in Valerio, Inc. , that was valued at $45 per share. At that time, Knight sold a call option on Valerio with an exercise price of $60 for $1.45. In December, at expiration, the stock is trading at $32. What is Knight’s profit (or loss) from his covered call strategy Knight:

A．

A. gained $11.55.

B．

B. lost $13.00.

C．

C. lost $11.55.
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