添加适量的扩孔剂也能一定程度地提高孔容.Addition of appropriate amount of pore - expanding agents could increase the pore volume.管道的选择, 测量, 切割, 扩孔和刻螺纹; 安装喷嘴以支撑管道系统.Select, measure, cut, ream and thread pipe, install sprinkler heads and moun...
The front and rear of the car will crumple during a collision.碰撞时，汽车的前部和后部会被撞瘪。Take care not to crumple your dress by packing it carelessly.当心不要因收放粗心压纵你的衣服.Don't crumple my clothes!别把我的衣服弄皱了!...