case

A case of some merchandise is a collection of items packaged together. A case is not a strict unit of measure. For consumer foodstuff such as canned goods, soda, cereal, and such, a case is typically 24 items, however cases may range from 12 to 36, typically in multiples of six. For larger bottles such as gallon jugs, a case is typically 4. dozen是12个。

A bookcase, or bookshelf, is a piece of furniture with horizontal, shelves, often in a cabinet, used to store books or other printed materials. Bookcases are used in private homes, public and university libraries, offices and bookstores. Bookcases range from small, low models the height of a table to high models reaching up to ceiling height. Shelves may be fixed or adjustable to different positions in the case. In rooms entirely devoted to the storage of books, such as libraries, they may be permanently fixed to the walls and/or floor.

A briefcase is a narrow hard-sided box-shaped bag or case used mainly for carrying papers and equipped with a handle. Lawyers commonly use briefcases to carry briefs to present to a court, hence the name. Businesspeople and other white collar professionals also use briefcases to carry papers, and since the 1980s, electronic devices such as laptop computers and tablet computers. Some briefcases have only a main internal space, while others may have subsections, accordion sections, small pockets, or dividers. Briefcases may be made from leather, vinyl, durable fabric, thin metal (such as aluminium), or plastic. Leather, vinyl [乙烯基塑料], or fabric briefcases may have externally-accessible pockets or sleeves in addition to the main storage space. Some briefcases made of fabric may have a shoulder strap. Briefcases typically have a lock to protect the contents. Nowadays, briefcases may have padded internal pouches to protect laptop computers.

vinyl也可做唱片。A suitcase is a form of luggage. It is often a somewhat flat, rectangular-shaped bag with rounded square corners, either metal, hard plastic or made of cloth, vinyl or leather that more or less retains its shape. Vinyl, leather or cloth suitcases may have a metal frame. It has a carrying handle on one side and is used mainly for transporting clothes, toiletries and other small possessions during trips. Hardshell suitcases open on hinges like a door. Suitcases may lock with keys or a combination.

A computer case, also known as a computer chassis /ˈʃæsi:/ [底盘;框架], tower, system unit, or cabinet, is the enclosure that contains most of the components of a personal computer (usually excluding the display, keyboard, and mouse). Cases are usually constructed from steel (often SECC—steel, electrogalvanized [电镀锌], cold-rolled, coil), aluminium and plastic. Other materials such as glass, wood, acrylic [丙烯酸塑料或树脂] and even Lego bricks have appeared in home-built cases.

SEC is the abbreviation of the Securities and Exchange Commission, which is a US government organization which makes sure that people and companies obey the laws about the sale of stocks and bonds. 呵呵。美国金融界著名经纪人、前纳斯达克董事会非执行主席、世界上最大的“庞氏骗局”炮制者伯纳德·麦道夫，Bernard Lawrence Madoff.

Next电脑的机箱：

Besides DVD-Video films, keep cases are very common with most video games since the PlayStation 2, as well as PC titles, and MP3-CD audiobooks (all use discs that are the same basic dimensions as a DVD).

A pencil case or pencil box is a container used to store pencils. A pencil case can also contain a variety of other stationery such as sharpeners, pens, glue sticks, erasers, scissors, rulers and calculators.

A road case, ATA case or flight case is a shipping container specifically built to protect musical instruments, motion picture equipment, audio and lighting production equipment, properties, firearms, or other sensitive equipment when it must be frequently moved between locations by ground or air. Many varying-sized road cases can be built to outfit the needs of an entire concert tour, or custom designed individually for a specific industry or product. The history of flight case design is based on an airplane parts packaging specification. It was designed by airline packaging engineers. The specification is ATA 300 Category I. ATA is the A4A (Airlines for America) International, formerly the Air Transport Association of America located in Washington, D.C. and consists of members like Boeing, Airbus, FedEx, American, United, and JetBlue.

In computer science, best, worst, and average cases of a given algorithm express what the resource usage is at least, at most and on average, respectively. Usually the resource being considered is running time, i.e. time complexity, but could also be memory or other resource. Best case is the function which performs the minimum number of steps on input data of n elements. Worst case is the function which performs the maximum number of steps on input data of size n. Average case is the function which performs an average number of steps on input data of n elements.

In software and systems engineering, a use case is a list of actions or event steps typically defining the interactions between a role (known in the Unified Modeling Language (UML) as an actor) and a system to achieve a goal. The actor can be a human or other external system. In systems engineering, use cases are used at a higher level than within software engineering, often representing missions or stakeholder goals. The detailed requirements may then be captured in the Systems Modeling Language (SysML) or as contractual statements.

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