The air outside the ball was ignored, and it was assumed that the air inside the ball behaved according to a compressive, viscous fluid-flow model.
分析假设球内空气的行为符合压缩、粘性流体流动模型。
The properties of the amalgams of spherical powders, such as dimension change during hardening, compressive strength, flow and creep meet the specification No.
球粉汞齐的性能，诸如固化过程中的尺寸变化，压缩强度，流变及蠕变等均达到美国牙医协会技术指标。
Cement additives are used to change the cement's density, setting time, compressive strength, flow properties and dehydration rate, to cause the cement to expand, and to reduce the cost of the cement.
水泥添加剂用来改变水泥的密度、凝固时间、抗压强度、流动性能和脱水率，并用来使水泥膨胀以及降低水泥成本。
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