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问题 单项选择题

下面四种PC机使用的DRAM内存条中，速度最快的是

A．存储器总线时钟频率为100MHz的SDRAM内存条

B．存储器总线时钟频率为133MHz的SDRAM内存条

C．存储器总线时钟频率为100MHz的DDR SDRAM内存条

D．存储器总线时钟频率为133MHz的DDR SDRAM内存条

答案

参考答案：D

解析： 存储器总线时钟频率越高，速度越快，而DDR SDRAM是采用高速内存新技术制成的，速度又比SDRAM高，所以选D。

完形填空

综合填空：用方框内所给词的适当形式填空，使短文意思完整、正确。(每小题1分，共10分)

One day a visitor came to Nasreddin’s house.  “I am your cousin小题1: Konya,” he said, “and I have brought you a duck to小题2: the visit”  Nasreddin was小题3: .  he asked his wife to cook the duck, and served the visitor a小题4: dinner.

The next day another visitor arrived.  “I am the friend of the man who brought you the duck.” He said. Nasreddin invited him in and gave小题5: a good meal.  The next day another visitor arrived, and said he was the friend of the friend of the man who had brought the duck.  Again Nasreddin invited him in for a meal.   小题6: , he was getting a bit angry. 小题7: seemed to be using his house as a restaurant.

Then another visitor came, and said he was the friend of the friend of the friend of the man who had brought the duck.  He was小题8: in.  Nasreddin’s wife brought some小题9: to the table and the visitor tasted it.  “What kind of soup is this?  It小题10: just like warm water.”  “Ah!” said Nasreddin, “That is the soup of the soup of the soup of the duck.”
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有哪些潮汐不等现象？如何产生？
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