题目内容

45.The Twitter "Fail Whale" is a common sight for most users of the micro blogging site. This error message appears whenever the system is over capacity and users cannot access their accounts or the pages of other Twitter users. Thus, the "Fail Whale" is indicative of Twitter's ____.

A.transaction speed
B.abandon rate
C.response time
D.downtime

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44.EasyBuy.com is an online retailer that sells books and magazines at half-price. They recently found out that due to the huge amounts of traffic that Web site receives, most users are unable to access the site when they want to and, when they do, the pages load very slowly. This is driving customers away to other rival online bookstores. This is an example of which of the following infrastructure-centric metrics?

A.Abandon rate
B.System availability
C.Error rate
D.Time service factor

以下哪种不属于HTML5音频所支持的文件格式？（）。

A. .ogg
B. .wav
C. .mp3
D. .mkv

HTML5中音频或视频的以下哪两个属性不可以同时使用？（）。

A. autoplay和preload
B. width和height
C. src和loop
D. url和controls

A. src
B. preload
C. controls
D. seekable