性质 金属：强度strength,塑性ductility,高熔点high melting point,导体 thermal and electrical conductivity,toughness. 陶瓷：硬脆hard and brittle,绝缘体insulators,不透明optically opaque, 半透明semi--transparent,.透明transparent,.耐热、耐腐蚀heat and corrosion resistant,比金属轻less dense than metals,难熔refractory 半导体：导电性介于导体与绝缘体之间conductivity between conductors and insulators 聚合物：重量轻light weight,,绝缘insulator,抗腐蚀anti-corrosion,低熔 点low melting point性质  金属 : 强度strength, 塑性ductility, 高熔点high melting point, 导体 thermal and electrical conductivity, 韧性toughness.  陶瓷: 硬脆hard and brittle, 绝缘体insulators, 不透明optically opaque, 半透明semi-transparent, 透明transparent, 耐热、耐腐蚀heat and corrosion resistant, 比金属轻less dense than metals, 难熔refractory  半导体: 导电性介于导体与绝缘体之间conductivity between conductors and insulators  聚合物: 重量轻light weight, 绝缘insulator, 抗腐蚀anti-corrosion, 低熔 点low melting point