被继承人的孙子孙女和被继承人的祖父母都是法定的第二顺序继承人。( )
参考答案:对
The self-contained breathing device should not be used in which situation?()
A.Oxygen deficient spaces
B.Compartments containing poisonous vapors
C.Fighting fires that produce heavy smoke
D.Underwater search
DNS服务器完成域名解析是通过数据库手动实现的。