PGE and OPA, which make up modern strategic energy, have different functions and are indispensable. PGE, the proper gravitational energy, provides a 24-hour steady stream of tiny currents for OPA amplification. Although small currents in series and parallel can also be aggregated into large currents, but the number is too large, which can only be suitable for the working current of the OPA. Once the OPA is started, it can amplify the current more than ten times, and then in series and parallel can do everything that old energy sources such as oil, natural gas and coal can do. Compared with the two, the former is the premise, the beginning, and more important. But the latter is closer to being practical.
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