【单选题】【消耗次数:1】
硬盘的磁头通过( )的变化来读取数据。
磁盘轨迹大小
磁片的轨迹
旋转速度
感应盘片上磁场
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相关题目
【单选题】 硬盘的磁头通过( )的变化来读取数据。
①  磁盘轨迹大小
②  磁片的轨迹
③  旋转速度
④  感应盘片上磁场
【单选题】 硬盘中的读写磁头在读写数据时,会与盘片:( )
①  靠近
②  接触
③  紧贴
④  不能确定
【单选题】 感应电动机的转速,永远()旋转磁场的转速。
①  大于
②  小于
③  等于
④  不变
【判断题】 旋转磁场的转速与外加电压大小有关,与电源频率无关。
①  正确
②  错误
【判断题】 在扫描特征过程中,【扫描轨迹】菜单管理器中选择【草绘轨迹】或【选取轨迹】来定义扫描轨迹。
①  正确
②  错误
【判断题】 ProE中,在扫描特征过程中,【扫描轨迹】菜单管理器中选择【草绘轨迹】或【选取轨迹】来定义扫描轨迹。()
①  正确
②  错误
【判断题】 硬盘是机电一体化设备,因为除了电路外里面有旋转的磁盘和径向运行的磁头等机械元件。
①  正确
②  错误
【单选题】 硬盘的盘片由表面镀有磁性物质的金属或玻璃等物质构成磁盘片的数据结构按照磁道从低到高可以分为4部分,其中数据区为 ( )。
①  MBR
②  DBR
③  FAT
④  DATA
【单选题】 用霍尔法测直流磁场的磁感应强度时,霍尔电压的大小()
①  与霍尔材料的性质无关;
②  与外加磁场的磁感应强度的大小成正比;
③  与霍尔片上的工作电流IS的大小成反比;
④  与霍尔片的厚度d成正比;
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③  等于
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①  enjoyment
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①  us…me
②  we… we
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①  essential
②  confusing
③  awful
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【单选题】 Things never went _____ as we had expected
①  so smoothly
②  smooth
③  so smooth
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【单选题】 Everyone of them _______ tired and wanted a good rest.
①  seems
②  is seemed
③  was seemed
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【单选题】 Peter: How about going to the movies tonight then?Mary: ____
①  I don’t know.
②  The movie is very interesting.
③  That sounds good.
④  The movie is very boring.
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①  essential
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【单选题】 The classroom is quite clean ____ some waste paper on the floor.
①  without
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【单选题】 All the men were under heavy____ working day and night
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