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  • One person can move a car

    One person can move a car

    Life Daily, October 16 News: On the 16th, the Jinan City Public Security Bureau organized an open day for police camps t...

  • Working principle of jack

    Working principle of jack

    The working principle of the hydraulic jack is that the wrench moves up to drive the small piston upwards. The oil in th...

  • Features of hydraulic jacks

    Features of hydraulic jacks

    1. Proper viscosity, good viscosity-temperature characteristics-hydraulic jackViscosity is the first factor to consider ...