“没有不透风的墙”一般是指信息的（）属性。
以下说法正确的是（） ["保险和社会救济都是以一定的风险事故的发生给人们的生产.生活带来困难为条件的","保险和储蓄都体现了自助原则","保险与社会福利都有补偿损失的功能","保险的给付金额与投保人交纳的保费金额直接相关，社会救济的救济金额与被救济人的社会贡献值"]
You work as an application developer at Certkiller .com. You have been given the responsibility of creating a class named CalcSalary that will determine the salaries of Certkiller .com’s staff. The CalcSalary class includes methods to increment and decrement staff salaries. The following code is included in the CalcSalary class： public class CalcSalary { // for promotions public static bool IncrementSalary （Employee Emp， double Amount） { if （Emp.Status == QuarterlyReview.AboveGoals） Emp.Salary += Amount； return true； } else return false； } //for demotions public static bool DecrementSalary （Employee Emp， double Amount） { if （Emp.Status == QuarterlyReview.AboveGoals） Emp.Salary -= Amount； return true； } else return false； } } You would like to invoke the IncrementSalary and DecrementSalary methods dynamically at runtime from the sales manager application， and decide to create a delegate named SalaryDelegate to invoke them. You need to ensure that you use the appropriate code to declare the SalaryDelegate delegate.What is the correct line of code？（） [" public delegate bool Salary （Employee Emp， double Amount）；"," public bool Salary （Employee Emp， double Amount）；"," public event bool Salary （Employee Emp， double Amount）；"," public delegate void Salary （Employee Emp， double Amount）；"]
矿井井下工作水泵的能力，应能在（）小时内排出矿井24小时的正常涌水量（包括充填水及其他用水）。 ["12","16","20","30"]
有一尸体，前额有多处砍伤，伤痕集中，排列整齐，方向一致，间距匀均。判断其损伤的性质是（） ["自杀伤","他杀伤","自卫伤","灾害损伤"]
试述托达罗人口迁移模型的内容及其在解决发展中国家就业问题上的政策含义。
