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更多“一、请大家练习常用DOS命令。DOS为计算机“远古时代的霸主”，经典而实用，因其短小精干在对计算资源十”相关的问题
1. For now, remember the
block? Use it to create a block that draws the petals of a flower, like:
If you look this flower, you'll see it has 6 squares drawn at equal angles around a full 360-degree rotation. Create the block:![block: draw square-leaved flower with [] leaves of size []](http://static.jiandati.com/7a8007c-chaoxing2016-23904.png)
that will draw a square-leaved flower with any number of square-shaped petals with the specified size. An invocation of
should sucessfully draw the example picture above. 2. Now, you are going to make a block that takes two inputs to draw a regular polygon.
Be sure to test out your solution with several polygons, with different lengths and number of sides.
A、直接拔掉为主机供电的插头可能会破坏硬盘数据文件。
B、不要频繁地做开、关机的动作，否则对硬盘的损坏较大，一般关机后应间隔一段时间才能再次开机。
C、计算机工作时，特别是驱动器正在读写数据时，忌强行关机，以免损伤驱动器或盘片。
D、正常关机顺序先关闭外设、显示器电源，最后关闭主机电源。
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