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问题 选择题

一个数的平方等于它本身，这个数是（　　）

A．1

B．0

C．0或1

D．1或-1

答案

方法1：02=0，12=1，（-1）2=1，所以平方等于它本身的有理数是0，1；

方法2：设这个数是x，

则x2=x，

解得x=0或1．

故选C．

单项选择题

对“先天性髋脱位”的论述，下列正确的是

A．较常见的先天性畸形，女多于男，左侧比右侧多

B．发病原因迄今不明

C．病理发生在髋臼、股骨头、颈、关节囊的原发性病变和继发性病变

D．治疗越早，效果越好且以上都是正确的
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多项选择题

Kingmart Joint Stock Company (Kingmart Company) was a listed joint stock company listing in Shanghai Securities Exchange, with total assets of RMB 500 million yuan; while Dahua Limited Liability Company’s (Dahua Company) registered capital was RMB 160 million yuan. At the end of 2009 the board of directors of Kingmart Company adopted a special board of directors’ resolution to merge with Dahua Company in a form of merger by absorption. After the completion of the merger plan Dahua Company would be dissolved.For the purpose of carrying forward the merger plan, Kingmart Company and Dahua Company should take some procedural steps before the merger plan could be implemented and settle the credit and/or debt of these two companies with other parties.Required:Answer the following questions in accordance with the relevant provisions of the Company Law, and give reasons for your answer:

(c) state how to deal with Dahua Company’s debts of RMB 500,000 yuan owed to a local electricity plant. (4 marks)
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