However, higher export orientation has opposite effect as to backward linkage and forwardlinkage.
然而，企业的出口倾向对前后向联系的作用相反。
2
The results show that the role of backward linkages of tourism in Yunnan Province are stronger than the forwardlinkage effects, and the internal correlation is not obvious;
研究结果表明，云南省旅游业后向关联作用明显强于前向关联作用，且内部关联作用不明显；
3
Then a vector control method with speed closed-loop and magnetic linkage closed loops put forward, which is based on the constant velocity by means of stator flux-oriented vector control.