The ball sprang back and hit him.
球打在他身上。
The ball sprang back and hit him.
球打在他身上。
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.
后密度的影主要为压力,其次为加压时和压缩次数,而含水率对板密度的影不明显。
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