Process objects play an important role in project management of PLM systems. Often, in order to perform a project activity, a corresponding software tool is required, so an activity can be associated with a certain relevant application. In this way, according to the object activity paramete…

1. Twin screw pump structure features Twin screw pump is an external meshing screw pump, which uses mutual engagement, do not touch two screws to pump liquid. Twin screw pump as a positive displacement pump, pump suction chamber should be closely spaced with the discharge chamber. Therefore, t…

(4) The heat treatment stress is to obtain uniform temperature on both sides of the inner and outer walls and the weld. When the temperature is constant, the temperature difference between any two points in the heating range should be <10 °C.

(5) During the heat treatment, th…

First, avoid sensitive periods for sensitive crops and crops. The sensitivity and tolerance of chlorine to different crops and varieties vary widely. Chlorine-sensitive crops are called chlorine-repellent crops. There are tobacco, tea, citrus, grape, watermelon, potato, and milk vetch. Gen…