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问题 单项选择题

鼻腭囊肿的特征为（）

A．近口腔部囊肿为鳞状上皮，近鼻腔侧为呼吸性上皮

B．衬里上皮为含黏液细胞的假复层纤毛柱状上皮

C．囊壁内可见小灶性散在慢性炎细胞浸润

D．结缔组织囊壁内含较大血管神经

E．以上都正确

答案

参考答案：D

单项选择题

An investor owns a share of stock worth $ 75 and buys a put option for a premium of $ 2 with a strike price of $ 65. What are the risk and return characteristics of the portfolio The:（）

A. portfolio has unlimited downside risk, but the upside potential is limited to $ 65.

B. portfolio’s downside risk is a price of $73, but there is no maximum to the upside potential.

C. portfolio’s downside risk is a price of $ 63, but there is no maximum to the upside potential.
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问答题 简答题

心房颤动的心电图特点是什么？
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