【单选题】对等计算(Peer to Peer computing,p2P)是指信息或服务提供者和使用者通过直接交换实现资源共享,形成非中心化的、自组织的、且所有或大部分联系是对称的分布式环境。根据上述定义,下列选项属于基于P2P的网络应用的是( )。
B.
利用电子商务的各种手段实现图书买卖过程的网上书店
C.
帮助检索者查找存储在互联网站上信息的网络搜索引擎
D.
提供用户存放、展示、分享照片等功能的网络电子相册
【单选题】What can be inferred from paragraph 47
A.
Dieting doesn’t play any role in slowing down agin9.
B.
Poor people necessarily live longer than rich people.
C.
Hungry people tend to commit suicide.
D.
Normally fed mice are prone to diseases.
【单选题】The driver began to speed up to ______ for the hour he’d lost in the traffic jams.
【简答题】I couldn’t believe my ears when I heard my name called for the leading role in our high school play. Mrs. Dermit, my drama(戏剧) teacher, had been looking for someone to play an energetic boy in a play....
【简答题】有静滑动摩擦力存在时,将全约束力和法线间夹角的()称为摩擦角,此时静摩擦力为()。
【单选题】Weather does not play an important role in s.
【简答题】X 射线物相定性分析的过程? 答: (1)实验:用粉末照相法或粉末衍射仪法获取被测试样相的衍射花 样或图谱。(2)通过对所获衍射图谱或花样的分析和计算获得各衍射线 条的2θ,d及相对强度大小I/I 1 。(3)使用检索手册,查寻物相PDF卡片 号。(4)若是多物相分析,则在(3)步完成后,对剩余的衍射线重新 根据相对强度排序,重复(3)步骤,直至全部衍射线能基本得到解释。
【简答题】Friends play an important role in our lives, and although we can’t be more familiar with the fact of friendship, we often don’t clearly understand how we make friends, especially with Americans. Here ...