为了从矿石中选出有用矿物，首先必须将矿石进行粉碎，使有用矿物和脉石（） ["磨细","分解","单体解离"]
方案教学主题的选择需遵循哪些原则？
简述刑事诉讼、民事诉讼和行政诉讼的证明对象有哪些？
package foo； import java.util.Vector； private class MyVector extends Vector { int i = 1； public MyVector（） { i = 2； } } public class MyNewVector extends MyVector { public MyNewVector （） { i = 4； } public static void main （String args ） { MyVector v = new MyNewVector（）； } } The file MyNewVector.java is shown in the exhibit. What is the result？（） [" Compilation will succeed."," Compilation will fail at line 5."," Compilation will fail at line 6."," Compilation will fail at line 14."," Compilation will fail at line 17."]
“三大诉讼”证明的差异有哪些？
生物膜
