The letterhead helps to form the impression of the writer’s firm, usually containing all or some of the following elements: the company’s name and address, postcode, telephone number, fax number, e-mail address, even web address, and etc.

A technician has been given a task to create a separate location for disaster recovery. Thecompany has very high uptime requirements and will lose money if there is any downtime. Whichof the following deployments should the technician consider？（） A: Hot site B: Warm site C: Fault tolerant site D: Cold site

【多选题】以下哪些是合法的josn数据表达( ) A: { "name": "zhangsan", "address":{ "city":"Beijing", "street":"Xisanqi", "postcode":100096 } } B: { "name":"zhangsan", "hobby":["篮球","羽毛球","游泳"]} C: {"name":"tom","age":"23"} D: [{"name":"tom","age":12},{"name":"rose","age":15}]

Putting in Order（排序题） Directions:Put the following parts into proper order to make a complete telephone message. A: ( )Will call again ( * ) Please call back ( * ) Urgent B: Operator: Cao Ming C: From: Mr. Ma Dong TelephoneNumber:021-82346759 To: Ms.ZhangXin Date: February 9,2006 Time: 10:30 a.m. D: Message:Mr.Ma Dong will go to Canada tomorrow and has something important to tell you. E: Telephone Message

氢原子轨道的能级高低是 A: E(1s)<E(2s)<E(2p)<E(3s)<E(3p)<E(3d)<E(4s) B: E(1s)<E(2s)<E(2p)<E(3s)<E(3p)<E(4s)<E(3d) C: E(1s)<E(2s)=E(2p)<E(3s)=E(3p)<E(4s)<E(3d) D: E(1s)<E(2s)=E(2p)<E(3s)=E(3p)=E(3d)<E(4s)