gravity xoan đào Gravity is the gravitational attraction at the surface of a planet or other celestial body; 6 gravity may also include, in addition to gravitation, the centrifugal force resulting from the planet's rotation see § Earth's gravity
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a fire hydrant Learn about the different types of fire hydrants, how they are used for firefighting, and what are the installation and testing requirements. Find out how to connect a hose, avoid water hammer, and comply with NFPA standards
