某双面盘记录区的外径为12cm，内径为10cm，磁道密度为80cm，内圈位密度为 4000bit/cm。则该磁盘在格式化之前的总容量为 (21) 字节，该磁盘共有 (22) 柱面， (23) 磁道。将该磁盘按每道18扇区格式化，每扇区512字节，则其存储容量为 (24) 字节。光盘存储器按存储介质可分为型变型、相变型和 (25) 。
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A.2、2 B.2、5 C.5、2 D.5、5 [单项选择]
There (56)a king who had twelve beautiful daughters. They (57) in twelve beds all in one room and when they went to bed, the (58) were shut and locked up. (59) , every morning(60) shoes were found to be quite worn through as if they had been danced in all night. Nobody could(61) how it happened, or (62)the princesses had been. So the king made it (63) to all that if any person could discover the(64)and find out where it was that the princesses danced in the(65), he would have the (66) he liked best to take as his wife, and would be king(67)his death. But whoever tried and did not succeed, after three days and nights, would be(68)to death. A prince from a nearby country soon came. He was well entertained, and in the evening was taken to the chamber (大房间) next(69) the one where the princesses lay in their twelve (70) . There he was to sit and(71) where they went to dance; and, in order(72) nothing could happen without him hearing it, the door of his(73) was left open. But the princ [不定项选择题]钢轨的外形可分为轨头、轨腰和轨底三部分，截面为（ ）。
A.一字型 B.三角型 C.工字型 D.四边形 [单项选择]埋深大于( )的称为深基础。
A. 4 m B. 5 m C. 6 m D. 5.5 m 我来回答: 提交
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