According to the latest two planes network and IPTN technology, this thesis tracked analyze the new developing direction and trend of MPLS VPN.
并且根据当前最新的双平面组网技术和IPTN技术跟踪分析了MPLS VPN当前的最新发展趋势和动向。
Firstly, the paper investigate the actuality and the developing trend of PLC control system, then put forward the study direction of this paper.
本论文首先对PLC系统的现状和发展趋势进行了相关调研，进而提出了本次课题的研究方向。
Meanwhile, forecast developing trend of China pipe market in first half year in 2006 and put forward the strive direction for the future.
同时，预测了2006年上半年中国钢管市场的发展趋势，提出了今后的努力方向。
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