【判断题】Expendable molds , which typically are made of sand, plaster, ceramics, and similar materials and generally are mixed with various binders(bonding agents) for improved properties. These materials are ...
【简答题】Some materials permit the movement of free electrons more easily than others , These materials are called conductors-copper, silver, and aluminum are good examples. Other materials restrict the moveme...
【单选题】Match the news with the right headlines. 为下面的新闻选择合适的标题。 Resilient thermoplastic composites are widely used in athletic footwear to enhance performance. These materials are well suited for footwear app...
A.
Composites enhance performance.
B.
Plastic makes your car more affordable yet powerful.