The ball sprang back and hit him.
球弹回打在

。
The ball sprang back and hit him.
球弹回打在

。
The main factor of spring back density is prepressing pressure, next are compression time and compression number of times.The effect of moisture content was not significant.
回弹后密度的影响因子主要为压力,其次为加压时
和压缩次数,而含水率对板坯回弹密度的影响不
。

:以
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