... air change rate 通风换气次数 ; 换气率 ; 空气更新率 ; 换气次数 material change rate 材料变换率 instantaneous speed change rate 瞬时调速率 ...
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material time rate of change 材料的时间变化率
The results show that the axis linear ablation rate of the material has a great change and the linear ablation increases along the gas flux direction.
结果表明：导流管轴向线烧蚀率变化较大，沿气流方向呈上升趋势。
The material of oil seal is advance, reasonable, and the processing of confect is preciseness. The change of pull intension rate is small. It suit varies of abominable environment.
因油封胶料配方先进、合理、配制过程严谨、拉伸强度变化率小，能适应各种恶劣的变化环境。
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