The world's average PM10 levels by region range from 21 to 142 ug/m3, with a world's average of 71 ug/m3.
各区域平均PM10(粒径范围为10微米的细微粒)水平范围为21~142ug/m3,世界平均水平为71ug/m3.
The principle and procedure of saving and quick setting of the drafting parameters in UG by using secondary development of UG are introduced in detail.
介绍了利用UG软件的二次开发功能，实现UG环境下制图参数的保存和快速设置的原理和方法，并给出主要程序段。
The second chapter introduces UG related knowledge and the methods of secondary development using UG OPEN API.
第二章则论述了UG的有关介绍以及利用UG OPEN API进行二次开发的方法。
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