The HD series heat-transfer oil has reasonable component and stabilization quality, all specification has approach and exceeds overseas products, and welcomed by the users.

In order to improve the frequency stabilization of the Doppler modulator, a series of affecting factors are considered in depth and optimized in the aspects of optics, mechanics and electronics.

Leachate and landfill gas (LFG) are released continually in the process of landfill stabilization, which causes a series of resources and environment problems.