题目

如图所示为一款铝合金置物架，现要求使用钢板设计一个中间连接件，能把置物架安装到墙壁上。连接件设计要求如下： A. 置物架能牢固安装在水泥墙壁上； B. 置物架不用时能向上翻转并稳定靠在墙上，放下时能水平放置； C. 置物架能方便、快捷地上翻和下放。 请根据上述设计要求，完成以下任务： （1） ①画出连接件的设计草图，必要时可用文字说明；②在设计草图上标注连接件的主要尺寸； （2） 置物架和连接件之间的连接方式Five years ago, David Smith wore an expensive suit to work every day. "I was a clothes addict," he jokes. "I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled." Today David wears casual clothes-khaki pants and sports shirt-to the office. He hardly ever wears necktie. "I'm working harder than ever," David says, "and I need to feel comfortable."More and more companies are allowing their office workers to wear casual clothes to work in the United States. The change from formal to casual office wear has been gradual. In the early 1990s, many companies allowed their employees to wear casual clothes on Friday (but only on Friday). This became known as "dress-down Friday" or "casual Friday." "What started out as an extra one-day-a-week benefit for employees has really become an everyday thing," said business consultant Maisly Jones. Why have so many companies started allowing their employees to wear casual clothes? One reason is that it's easier for a company to attract new employees if it has a casual dress code. "A lot of young people don't want to dress up for work," says the owner of a software company, "so it's hard to hire people if you have a conservative dress code." Another reason is that people seem happier and more productive when they are wearing comfortable clothes. In a study conducted by Levi Strauss and Company, 85 percent of employers said that they believe that casual dress improves employee morale. Only 4 percent of employers said that casual dress has a negative impact on productive. Supporters of casual office wear also argue that a casual dress code helps them save money. "Suits are expensive, if you have to wear one every day," one person said."For the same amount of money, you can buy a lot more casual clothes."【1】David Smith refers to himself as having been "a clothes addict" because _____.A. he often wore khaki pants and a sports shirtB. he couldn't stand a clean appearanceC. he wanted his clothes to look neat all the timeD. he didn't want to spend much money on clothes【2】David Smith wears casual clothes now, because _____.A. they make him feel at ease when workingB. he cannot afford to buy expensive clothesC. he looks handsome in casual clothesD. he no longer works for any company【3】In this passage, the following advantages of casual office wear are mentioned EXCEPT _____.A. saving employees' moneyB. making employees more attractiveC. improving employees' motivationD. making employees happier