正弦交流电的有效值等于最大值的（）。 ["0.637","0.707","0.9","1.414"]
Assume that country is set for each class. Given： 10. public class Money { 11. private String country， name； 12. public getCountry（） { return country； } 13.} and： 24. class Yen extends Money { 25. public String getCountry（） { return super.country； } 26. } 27. 28. class Euro extends Money { 29. public String getCountry（String timeZone） { 30. return super.getCountry（）； 31. } 32. } Which two are correct？（） [" Yen returns correct values."," Euro returns correct values."," An exception is thrown at runtime."," Yen and Euro both return correct values."," Compilation fails because of an error at line 25."," Compilation fails because of an error at line 30."]
库房湿度变化主要受（）的影响。 ["库温","天气","月份","季节"]
下列关于退休规划说法正确的是（） ["计划开始不宜太迟","规划期应当在五年左右","投资应当极其保守","对投资和风险应当相当乐观"]
流量测量的不确定度是表征被测量的（）在某个量值范围内的一种估计。 ["真值","假值","约数","整数"]
生产的经济区域
