Precoated sand made of mixing this kind of resin and sand can serve as laser sintering material which suits laser rapid molding process much more.
这种烧结剂是一种改性酚醛树脂，它和作为耐火骨料的原砂混合制成覆膜砂作为激光烧结材料更加适用于激光快速成型过程。
The pavement cement concrete is usually prepared by sand, stone, cement, water, feed mixing process, the quality fluctuates easily.
路面水泥混凝土通常是按砂、石、水泥、水一次投料的搅拌工艺制备的，其质量容易波动。
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