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[null,null,null,null,"现代电脑五大基本部件"]
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[null,null,null,"1 指令和数据通过输入设备送进存储器；"]
[null,null,null,"2 经过控制器译码后，控制着运算器操作数据运算，运算结果送回存储器；"]
[null,null,null,"3 最后由输出设备显示和打印出来；"]

{"sheet":"执行一个程序的数据流","index":1,"n_rows":76,"n_cols":13,"rows_kept":76,"cut":false,"hidden":false,"merged":[]}
[null,"执行一个程序的数据流",null,null,null,null,null,null,null,null,null,null,"《深入理解计算机系统》"]
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[null,null,null,null,null,null,null,null,null,null,null,null,"一 执行hello程序"]
[null,null,null,null,null,null,null,null,null,null,null,null,"1 当用户输入hello后，shell程序逐一读取字符到寄存器；"]
[null,null,null,null,null,null,null,null,null,null,null,null,"2 放到主存储器"]
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[null,null,null,null,null,"系统总线"]
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["二"]
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[null,null,null,null,null,null,null,null,null,null,null,null,"二 从磁盘加载可执行文件到主存"]
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["三"]
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[null,null,null,null,null,null,null,null,null,null,null,null,"三 从存储器写输出串到显示器"]
[null,null,null,null,null,null,null,null,null,null,null,null,"1 指令从存储器中拷贝到寄存器"]
[null,null,null,null,null,null,null,null,null,null,null,null,"2 从寄存器文件到显示器；"]
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[null,null,null,null,null,"系统总线"]

{"sheet":"CAD基础 概念","index":2,"n_rows":71,"n_cols":2,"rows_kept":71,"cut":false,"hidden":true,"merged":[]}
[null,"CAD tips"]
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["概念性的东西"]
[1,"标注"]
[null,"1 设置标注样式：标注---标注样式---修改---调整（选项卡），使用全局比例：（最大值/300）*2（或除于100,再打个5折，（文字样式的高度要*2））即在A4纸294*210上，或将屏幕缩为A4大小，3-5为可见（标注样式内的文字有默认高度2.5）\n或者：屏幕的Y轴值的最高坐标/100;文字高度：再乘2，标注--调整的调整的全局比例：再除2,填充-比例：再除6；"]
[null,"2 标注可设置的图层；"]
[null,"3 标注的引线可利用夹点进行拖动；"]
[null,"标注工具栏内有公差工具；形位公差在系统中作为一个实体进行处理，和其他尺寸标注一样，可以对其进行常规的操作，如旋转、移动和复制等；标注形位公差时可用引线工具进行配合；"]
[]
[2,"多线："]
[null,"14.1 设置多线样式：格式---多线样式---新建---命名---继续："]
[null,"a 图元设置：偏移、颜色、线形；"]
[null,"b 封口设置：起点、端点，可分别设置为直线、内弧、外弧；"]
[null,"14.2 将设置的多线样式置为当前，当需要使用另一个多线样式时，需要再次打开格式---多线样式---选择样式名---置为当前，也可以在样式选项中直接地输入样式名；如果一个样式名要s1已有使用，则不能再修改，但可新建一个样式s3，以S1为基础，查看S1的设置；"]
[null,"14.3 绘图---多线---分别设置：对正、比例、样式；"]
[null,"如：S1：封口起点：直线；端点：直线+外弧；两条线分别偏移0.5；S比例：1500,长：370；则绘制的多线为一个1500*370的矩形加一个直径为1500的圆弧；"]
[null,"注1：画建筑平面图时，可用单线作为尺寸线，画在尺寸线图层内；可用多线画墙体线，设置墙体线图层，封口为直线，两线偏移为0.5,150的增加设置比例为150；"]
[null,"注2：多线可以分解，进行单独的编辑；"]
[null,"注3：多线的宽度等于：（第一条的偏移量-最未一条的偏移量）*比例S"]
[]
[3,"文字格式"]
[null,"1 设置样式：最大值/300）*2（或除于100,再*2）在封闭的矩形内，多行文字可分别点到两个对角，然后设置不居中对齐；"]
[null,"2 如果用单层文字输入是？时，可选择用多行文字输入；"]
[]
[4,"边界："]
[null,"绘图---边界"]
[null,"拾取点：---对象类型：可以是多线段；"]
[]
[5,"pline线"]
[null,"具备宽度（rec亦具备宽度）；"]
[null,"w---始点宽度---端点宽度（如果是0,则形成箭头样式）"]
[null,"多线段的高度设置；"]
[null,"1 视图：东南等轴侧；"]
[null,"2 新建图层；"]
[null,"3 elev:可以定义L和PL的高度：厚高，相当于三维的Z轴；还可以定义PL的厚度，即标高，相当于三维的Y轴；elev有定义后，画L或PL时要重新发回默认参数0,0才可；"]
[null,"4 pline"]
[null,"5 工具栏：渲染---隐藏；"]
[null,"6 pedit可以将多线段合并到多线段；或直线变成多线段合并"]
[]
[6,"CAD图纸到效果图"]
[null,"23.1 CAD图要分层；"]
[null,"23.2 输出为EPS文件，用illustrator打开编辑；（illustrator可直接打开DWG文件，并有保留图层）；"]
[null,"23.3 可用illustrator保存为PSD文件，然后用PS进行编辑形成效果图；"]
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[7,"样条曲线："]
[null,"1 画完后如果不对开始和结束点两端的弧度进行调整，可直接回两次车；"]
[null,"2 经过多点的曲线可用样条曲线画；"]
[]
[8,"模板：一个有建立图层、设置标注样式、点样式、多线样式以及各种设置和块的文档，当保存为模块后，用此模块打开的文档，上述相关的属性会同时保留在新建文档中；"]
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[9,"CAD可以利用块、模板来提高画图速度；"]
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[10,"CAD可以对已有的图像进行描边，形成矢量图形；（CAD可插入的文件：JPG，PNG，TIFF;插入：光栅图像参照；）"]
[]
[11,"引线le"]
[null,"le（在标注菜单）---S设置"]
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[12,"光标大小："]
[null,"工具---选项---光标大小：100：可用于对齐或描图；"]
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[null,"视图---动态观察---连续动态观察可对部分选定对象进行观察；连续动态观察时，双击两下即可停住；"]
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[null,"0度角的方向是东，即为X轴正向，角度的正增量方向为逆时针counter clockwise方向；"]
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[null,"相对坐标和极坐标：如相对于长方形（100*100）上的左下角的@155,155的位置，绘制一条呈22度度的长度为1000的直线：L；shift+右键，F，点击左下角，输入：@155,155,再输入：1000<45;"]
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[null,"阵列方向：行偏移为负值，则行添加在下面，如果列偏移为负值，则列添加在左边；对于填充角度，负值指定顺时针旋转；"]
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[null,"复制，或偏移某跨度，其距离是包含对象对内的；"]
[null,"阵列、镜像、复制、偏移四个命令有相通之处，增加相同的图形，并进行精确定位；"]