文档介绍：蒙版的使用方法
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang cilower knots of up to 500,000 yuan fee collection tasks. 5, further standardize internal management, improve staff quality. Adhere to the
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang city Building under easy fare, daily special inspection and regulation, overfulfilled the province upper and lower knots of up to 500,000 yuan fee collection tasks. 5, further standardize internal management, improve staff quality. Adhere to the
作修改。听起来很像选区，实际上蒙板和选区的确可以互相转换，只不过蒙板的修改、变形比选区更加灵活和自由，是一个可视的区域，具有良好的可控制性。
二、谁需要使用蒙板
当然不是在任何时候都需要接触蒙板，而且我有理由相信很多人至今未曾用过。谁最需要蒙板呢？还记得自己的自行车置身于拥挤的车棚里时的情景吗？怎样做才能轻松地取出自己的车子而不碰倒其他的？如果你就是那个面对自己的车子满头大汗的人，你就需要蒙板。
三、蒙板的建立
如果你对蒙板有了一些概念，那我们进入正题。
创建蒙板的方式比较多，你大可依据自己的爱好****惯或者不同的编辑状态选用自己的方式，常用的有：
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang city Building under easy fare, daily special inspection and regulation, overfulfilled the province upper and lower knots of up to 500,000 yuan fee collection tasks. 5, further standardize internal management, improve staff quality. Adhere to the
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang city Building under easy fare, daily special inspection and regulation, overfulfilled the province upper and lower knots of up to 500,000 yuan fee collection tasks. 5, further standardize internal management, improve staff quality. Adhere to the
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang city Building under easy fare, daily special inspection and regulation, overfulfilled the province upper and lower knots of up to 500,000 yuan fee collection tasks. 5, further standardize internal management, improve staff quality. Adhere to the
（1）用选择工具建立一个选区并存储，在对话框中设置相关参数，就可以创建一个蒙板