称量硬币时将硬币放在秤的一端，另一端则放已知重量的砝码，直至两端平衡。
To weigh the coin, it would be put on one side of scale, and counterweights of a known weight would be put on the other side until the scales balanced.
燃油泵(卸油泵，高粘度泵，沥青泵)齿轮的磨损部位主要是齿的啮合、渐开线工作面和齿轮两端平面。
Fuel pump (unloading pump, high viscosity pump, asphalt pump) gear wear and tear parts mainly is the tooth meshing, involute face and gear ends plane.
齿轮齿面严重磨损时应更换新齿轮，如果只是齿轮的两端平面磨损，可在平面磨床上磨削修光。
Gear tooth face serious wear new gear should be changed, if only gear at both ends of the plane wear, can be in surface grinding machine on grinding repair light.
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