big surface source的用法和样例：
- A surface source distribution is used to replace the boss and the vortex lattice representation of propeller blader is also incorporated.
- This model consists of point source, scattering surface source, volume source and line source.
- Newly designed power supply system. While in machining big surface and deep hole, the computer provides two steps servo feed for superior machining quality and discharge accuracy.
- The relative high-end market, the small family furniture's market quantity big surface is broad, actually with difficulty batched production.How to seek for the balance point between both?
- This paper introduces present situation of rural surface source pollution of our country, forecasts their longterm developmontal trend, arid gives the controlling pollution objective and tactics.