Volumetric efficiency is a very important parameter to test whether the engine has a good process of air exchange, its also an important guide line to scale the engine performance.
充量系数是表征换气过程进行完善程度的一个极为重要的参数，是衡量发动机性能的重要指标。
High performance concrete should have not only high strength, but also excellent durability, relatively high crack resistance and relatively high volumetric stability, etc.
高性能混凝土不仅只是具有较高的强度，而且还应具有良好的耐久性，较高的抗热裂性能以及较高的尺寸稳定性等。
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