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Explanation: All of the above answers only considered the process flow as a step-by-step execution of a technological process. This is correct, in general terms, except such a process flow cannot physically break a conductive circuit. Fot this we need a tangible, physical flow of material. Here, the process flow most likely refers to the process fluid flow, or поток технологического раствора или технологической жидкости или рабочего раствора.