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问题 选择题

有些老师上课时使用便携扩音设备，使声音更加宏亮，这是为了增大声音的

A．音调

B．音色

C．频率

D．响度

答案

答案：D

题目分析：物理学中把人耳能感觉到的声音的强弱称为响度，响度的大小与声音的振幅有关，振幅越大，响度越大，振幅越小，响度越小．老师使用扩音设备后，学生感到声音的强度增大，听的更为清楚，所以这样做的目的是为了增大声音的响度；

故选D．

点评：此题要结合声音的特征响度定义进行分析解答，注意与其它特征的区分．

单项选择题

地下市政管理线沿道路布置时，下列关于管线由路边向路中排列合理的是( )。

A．电缆、热力管网、污水管

B．污水管、热力管网、电缆

C．热力管网、污水管、电缆

D．污水管、电缆、热力管网
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问答题

Mr Liu entered into an agreement to buy a second-hand car from Mr Feng at a price of RMB 50,000 yuan. After the conclusion of the agreement, Mr Liu paid the price and Feng delivered the car to Mr Liu. The two parties, however, did not register the sale of the car. Following the sale Mr Liu took the car to a repair shop to repair the air conditioner. After the completion of the repair and on the way home, a fire accident occurred due to the defect of the air conditioner and caused serious damage to the car. Mr Liu returned to the repair shop claiming compensation for the defect of the air conditioner. The repair shop insisted that it was not liable for the fire accident and the resulting damage to the car. In addition, after retrieval of the data from the local vehicles registration centre, the repair shop found that the registered owner of the car was still Mr Feng, not Mr Liu. Under such a situation it refused to discuss the dispute any more with Mr Liu, on the ground that he was not a legitimate owner of the car. When Mr Liu asked Mr Feng to negotiate with the repair shop, Mr Feng was reluctant to do so on the ground that the transaction between them was over since he had duly delivered the car to Mr Liu. Required: Answer the following questions in accordance with the relevant provisions of the Property Law, and give your reasons for your answer:

(b) state who should be the legitimate owner of the car; (4 marks)
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