Open hydrostatic slideway has many advantages, that is, high moving precision, low power in friction, non-crawling and long working life. Near constant clearanc
The key to control Spin-Stabilized Satellites Synchronously is to determine the models for calculating and correcting of time-delay at the different situations.
The directional crossing drilling works were applied in the West-East gas pipeline(WEGTP) project.The main researehs on the directional crossing drilling includ