皮皮学，免费搜题
登录
搜题
【多选题】
电子文件的认证是确保电子文件真实、完整、可用、安全的重要手段，其内容主要包括（）。A.
来源认证
B.
身份的认证
C.
内容的认证
D.
价值认证
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When you compose a business messages, you often need to cater for several levels of readership. ( )
A.
True
B.
False
【简答题】简述带式输送机张紧装置的作用。
【简答题】分析样本的采集应遵循（ ）原则。
【单选题】When you are writing a body paragraph, always compose the topic sentence first, because ______.
A.
it presents a question to reader to think about the main idea
B.
it makes all the information go smoothly
C.
it provides most important example
D.
it clarifies what the write will talk about and gives reader a sense of direction
【简答题】( ) 4. Instructions for how to use a digital camera A) You must mm the camera on before removing the lens cover. B) Put the target mark in the center of the viewfinder on the subject for better...
【单选题】Before you begin to compose a business letter, sit down and think about your purpose in writing the letter. Do you want to request information, order a product, register a complaint, or apply for some...
A.
. planning is an important part of writing a business letter.
B.
business letters are frequently complaint letters
C.
brainstorming and writing take approxi?mately equal amounts of time.
D.
. many people fail to plan ahead when they are writing a business letter.
【单选题】下列关于核武器的相关描述，正确的是（）。
A.
继美国之后，苏联是第二个拥有核武器的国家
B.
“曼哈顿工程”的主要研究对象是氢弹
C.
受美国技术支持，英国是世界上研制原子弹和氢弹时间间隔最短的国家
D.
在美苏早期的核试验中，主要以大气圈核试验为主
【简答题】词分为( )和( ),又叫( )。在《清平乐●村居》中,清平乐是( ),村居是( )。亡赖的意思是( )。
相关题目：