The paper expounds in detail the relation between oil density and metering and suggests that it is necessary to propagand metrical knowledge to customers.
Odorization pumps are specially designed diaphragm plunger metering pump, plunger travel of the exercise machine lock, each time to maintain a constant output.
This paper described the basic concept and expressions of the decibel and Neper. It also explained some merits of the calculation rntes and Application ranges of the measuremeut Units.
In the presence of impurities or in a nonstoichiometric solid, free electrons or electron holes are produced as a result of “charge compensation” to neutralize the effect of charged ionic defects 。