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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.(4) Electronic time relay is also called electronic time relay, which uses delay circuit to delay. This relay has high precision and small volume.由四位幕后执笔﹑David Wain及Bill Benz执导的《医界警察》讲述两名驻守在巴西圣保罗一间儿科医院的医生（Erinn Hayes及Rob Huebel饰演），他们在此发现一种足以威胁人类文明的病毒，于是他们被政府招募，得与时间竞赛下找到病毒的解药。然后猛然一推。　　第四季剧情讲述在9个月后，因为核弹爆炸而引起的核冬天遮掩了太阳，令到陷入长期黑暗的世界受没了活动限制的血族所控制，并让血祖建立了一个极权主义的政权。再加上一些天意和巧合的事情，最终使得刘邦安然逃离，成为一个潜在的威胁。220. X.X.243