当管受到挤压时,胶凝体便从微小的孔被挤入.When the tube is squeezed the gel is forced through tiny holes.无 宏观 缺陷水泥已成为高性能胶凝材料学科的重要研究方向.Macro - defect - free cements have become an important orientation of high performance cementitious materia...
多数藻类生长在水中.Most algae live in water.这已经用于附生藻类和沉水维管束植物中.It has been applied to attached algae and submerged vascular plants.促进了水生植物如藻类的生长, 可能毁坏鱼类的繁殖.The growth of aquatic plants like algae is hastened, and fish reproductio...