何谓吸附(收)法?
public class Base { public static final String FOO = “foo”; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); System.out.print(Sub.FOO); System.out.print(b.FOO); System.out.print(s.FOO); System.out.print(((Base)s).FOO); } } class Sub extends Base {public static final String FOO=bar;} What is the result?() [" foofoofoofoofoo"," foobarfoobarbar"," foobarfoofoofoo"," foobarfoobarfoo"," barbarbarbarbar"," foofoofoobarbar"," foofoofoobarfoo"]
为什么说场效应管是一种电压控制元件?
足球比赛掷界外球时,()。 ["可单脚离地","可双脚离地","双脚均不能离地","可进入比赛场地"]
灰铸铁以符号()表示。 ["HT","Z","K","DT"]
混合的基本原理为哪三种作用?