恒重是指两次称量所得质量之差不得超过一定的允许误差。《火电厂排水水质分析方法》（DL/T 938-2005）对恒重的定义：连续两次烘干或灼烧后的质量，其差值不超过0.0003g。
用已烘干至恒重的G4玻璃坩埚过滤。
Filter the mixture with a G4 glass crucible pre-dried to a constant weight.
因此，为了让这个定境展开，持恒、仔细、审慎等这些素质是十分重要的。
So these qualities of consistency, care, and heedfulness are important in allowing this state of concentration to develop.
因此开展配流副特性研究，对开发设计这种多作用恒流轴向柱塞泵具有十分重要的指导意义和现实意义。
So, the study of characteristics of port plate pairs has great guiding significance and practical significance to the development and design of multi-action constant axial piston pump.
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