搜题请搜索小程序“爱下问搜题”
问题 单项选择题

已知O为坐标原点，F是椭圆C：的左焦点，A，B分别为C的左，右顶点。P为C上一点，且PF⊥x轴。过点A的直线l与线段PF交于点M，与y轴交于点E。若直线BM经过OE的中点，则C的离心率为（）。

A.A

B.B

C.C

D.D

答案

参考答案：A

单项选择题 A1/A2型题

引起周围性眩晕的因素有（）。

A.小脑肿瘤

B.听神经纤维瘤

C.椎-基底动脉供血不足

D.链霉素、庆大霉素中毒

E.多发性硬化（中枢神经炎性腱鞘病）
查看答案
多项选择题

Manco has been experiencing substantial losses at its furniture making operation which is treated as a separate operating segment. The company’s year end is 30 September. At a meeting on 1 July 2010 the directors decided to close down the furniture making operation on 31 January 2011 and then dispose of its non-current assets on apiecemeal basis. Affected employees and customers were informed of the decision and a press announcement was made immediately after the meeting. The directors have obtained the following information in relation to the closure of the operation:(i) On 1 July 2010, the factory had a carrying amount of $3·6 million and is expected to be sold for net proceeds of $5 million. On the same date the plant had a carrying amount of $2·8 million, but it is anticipated that it will only realise net proceeds of $500,000.(ii) Of the employees affected by the closure, the majority will be made redundant at cost of $750,000, the remainder will be retrained at a cost of $200,000 and given work in one of the company’s other operations.(iii) Trading losses from 1 July to 30 September 2010 are expected to be $600,000 and from this date to the closure on 31 January 2011 a further $1 million of trading losses are expected.Required:
查看答案