简要论述物料卡的作用？
Which three demonstrate an “is a” relationship？（） [" public class X { } public class Y extends X { }"," public interface Shape { } public interface Rectangle extends Shape{ }"," public interface Color { } public class Shape { private Color color； }"," public interface Species { } public class Animal { private Species species； }"," public class Person { } public class Employee { public Employee（Person person） { }"," interface Component { } class Container implements Component { private Component[] children； }"]
（）是互联网最本质的文化。 ["分享","传播","尊重人性","尊重知识"]
关于国际工程施工承包合同争议调解解决方式的说法，错误的是（）。 ["能较好地表达双方对协商谈判结果的不满意和争取解决争议的决心","由于调解人的介入，增加了解决争议的公正性","程序简单，但灵活性不够","节约时间、精力和费用"]
脑震荡
耗水率
