This paper discusses the advance of computer aided design, analysis and optimum in packaging engineering, and introduces the technology of net aided packaging design.
结合包装工程学科的有关领域，论述了计算机辅助包装设计、分析与优化的若干进展，介绍了网络辅助包装设计技术。
Training a multilayer neural net by BP algorithm is slow and it is difficult to choose the number of hidden units and layers in advance.
使用BP算法训练多层网络的速度很慢而且事先难于确定隐节点和隐层的适当数目。
The net friends can advance their questions freely as well as help other people solve the problems, or exchange experience.
网友可以自由地提出问题以及帮助他人解决问题，或者交流经验（略）。
Before declaring exports to customs, the enterprise shall record the serial number of the new version Verification Certificate at the same customs that it will declare to by inter-net in advance.
企业在出口货物申报之前，必须预先将新版核销单编号上网向出口报关地海关备案。
In this case, by changing the ways of its outgoing lines and using the existing net stands, it could put into operation in advance finally.
为此，通过变更电站出线方式，利用现有的网架条件，最终实现电站提前投产。
On the current market, replacing tools of money mainly include token money instrument, stored value card and virtual net money, which all belong to advance payment tools.
当前市场上的代币工具主要包括代币票券、不记名储值卡、网络虚拟货币，它们都属于预付式工具，从一般预付式工具到代币工具是一个货币性渐增的连续区间。
After 2008, the net of high-speed dedicated passenger railway is to be formed, and the accomplishment of it shall substantially advance the competitiveness of the railway.
2008年后，高速客运专线网将逐步形成，高速客运专线的建成将大幅度提高铁路的竞争能力。
After 2008, the net of high-speed dedicated passenger railway is to be formed, and the accomplishment of it shall substantially advance the competitiveness of the railway.
2008年后，高速客运专线网将逐步形成，高速客运专线的建成将大幅度提高铁路的竞争能力。
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