In China, research of this gas-film lubrication theory is not yet perfect, and the research of triturating detection device using the theory is yet in blank.
In order to achieve the fabrication of noninvolute beveloid gears with crossed axes by using the existing machine tools, the tooth profile errors and axial errors should be studied.
As a kind of design of promotion flackery, the design of real estate description focused on the apparent functions but ignored the study of systematic theories which even was blank in the past.