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英布道：萧将军已经赶回大半日了，算着时候，司马欣按理是该到了。Third, practice deliberately and turn good speech rules into habits.Positive bottom stack mode. The color information in each channel is investigated, and the underlying color is superimposed on the positive film. The principle is the same as the "subtractive principle" in the color mode. The color produced by this mixture is always darker than the original. If there is a positive film stack with black, only black will be produced. Mixing with white will not have any effect on the original color.看了这个回答，杨舟心中顿时了然，然后连忙发帖感谢对方解惑。Cloud manufacturing provides a brand-new concept and mode for manufacturing informatization. As a nascent concept, cloud manufacturing has huge development space in the future. However, the future development of cloud manufacturing still faces many key technology challenges. In addition to the comprehensive integration of cloud computing, Internet of Things, Semantic Web, high-performance computing, embedded systems and other technologies, knowledge-based technologies such as cloud-based manufacturing resources, manufacturing cloud management engine, cloud manufacturing application collaboration, cloud manufacturing visualization and user interface are all important technologies to be overcome in the future.