In the light of the pickup current of a submersible electric pump being too large when started at full pressure, a new variable frequency control system is developed.

针对电动潜油泵工频全压启动时存在启动电流过大等诸多问题，开发出新型电动潜油泵变频控制系统。

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Profit margins are under pressure from high oil prices and, latterly, from a pickup in wage growth.

ECONOMIST: Europe��s monetary policy: The wages of sin | The