波前和射线两者之间的关系如何?
在一定条件下,增加公共物品消费者人数并不需要减少其他消费品的生产。
简述证据保全的意义。
简述证据保全的种类。
public class WhileFoo { public static void main (String []args) { int x= 1, y = 6; while (y--) {x--;} system.out.printIn(“x=” + x “y =” + y); } } What is the result?() [" The output is x = 6 y = 0"," The output is x = 7 y = 0"," The output is x = 6 y = -1"," The output is x = 7 y = -1"," Compilation will fail."]
社会性行为问题的一般特征有:()、不受普遍方法控制的行为、不理会现实、幼儿生活中存在客观困难。