It is found that shock toughness of powder forging part can be increased obviously by diffusion annealing for long time.
发现长时间扩散退火可显著提高粉末锻件的冲击韧性。
For one thing, the diffusion of knowledge in ancient India was accomplished by word-of-mouth for quite a long period of time before written modes of communication were adopted.
首先，古印度的理念传承在手写被采用前的很长的历史时期中是通过口述来完成的。
On the condition of long time seawater corrosion, the hydroxide ion diffusion coefficient and the chlorion diffusion coefficient of fly ash concrete are far smaller than th...
在长期海水侵蚀下，掺粉煤灰混凝土的氢氧离子扩散系数的氯离子扩散系数亦均远小于基准混凝土。
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