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问题 单项选择题

假设一个有3个盘片的硬盘，共有4个记录面，转速为7200r/min，盘面有效记录区域的外直径为30cm，内直径为10cm，记录位密度为250bit/mm，磁道密度为8道/mm，每磁道分16个扇区，每扇区512B，则该硬盘的非格式化容量和格式化容量约为 (20) ，数据传输速率约为 (21) 。若一个文件超出一个磁道容量，剩下的部分 (22) 。

A．120MB和100MB

B．30MB和25MB

C．60MB和50MB

D．22．5MB和25MB

答案

参考答案：B

单项选择题

我国《证券公司管理办法》规定，经纪类证券公司具备相应证券从业资格的从业人员应不少于( )人。

A．50

B．30

C．15

D．10
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单项选择题

Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route—through the boot.
Mr. Johnson’s car had finished up in a ditch at Romney Marsin, Kent after skidding on ice and hitting a bank. "Fortunately, the water began to come in only slowly, " Mr. Johnson said. "I couldn’t force the doors because they were jammed against the walls of the ditch and dared not open the windows because I knew water would come flooding in. "
Mr. Johnson, a sweet salesman of Sitting Home, Kent, first tried to attract the attention of other motorists by sounding the horn and hammering on the roof and boot. Then he began his struggle to escape.
Later he said, "It was really a half penny that saved my life. It was the only coin I had in my pocket and I used it to unscrew the back seat to get into the boot. I hammered desperately with a hammer trying to make someone hear, but no help came. "
It took ten minutes to unscrew the seat, and a further five minutes to clear the sweet samples from the boot. Then Mr. Johnson found a wrench and began to work on the boot lock. Fifteen minutes passed by. "It was the only chance I had. Finally it gave, but as soon as I moved the boot lid, the water and mud poured in. I forced the lid down into the mud and scrambled clear as the car filled up. "
His hands and arms cut and bruised, Mr. Johnson got to Beckett Farm nearby, where he was looked after by the farmer’s wife, Mrs. Lucy Bates. Huddled in a blanket, he said, "That thirty minutes seemed like hours. " Only the tips of the car wheels were visible, police said last night. The vehicle had sunk into two feet of mud at the bottom of the ditch.

Which statement is true according to the passage

A. Mr. Johnson’s car stood on its boot as it fell down.
B. Mr. Johnson could not escape from the door because it was full of sweet jam.
C. Mr. Johnson’s car accident was partly due to the slippery road.
D. Mr. Johnson struggled in the pouring mud as he unscrewed the back seat.
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