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。
public class X { public static void main （String[] args） { byte b = 127； byte c = 126； byte d = b + c； } } Which statement is true？（） [" Compilation succeeds and d takes the value 253."," Line 5 contains an error that prevents compilation."," Line 5 throws an exception indicating “Out of range”"," Line 3 and 4 contain error that prevent compilation."," The compilation succeeds and d takes the value of 1."]
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."]
房屋建筑工程所在地的县级以上地方人民政府建设行政主管部门发现建设单位在竣工验收过程中有违反国家有关建设工程质量管理规定行为的，应当在收讫竣工验收备案文件（）d内，责令停止使用，重新组织竣工验收。 ["10","15","20","25"]
焦虑具有两个关键特征：即强烈的负面情绪和（）。
