题目内容
带传动的圆周速度V>5m/s是有利于提高承载能力，而V<25m/s是主要为了( )。
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设计带传动时，中心距一定的小带轮上的包角大小取决于( )，而带的长度取决于大、小带轮的直径。
A段和E段为给定顺序（就是A段和E段的位置符合字母表的顺序，也就是说，第一段选A，第五段选E。不好意思没说清楚。）。多余选项填入最后的空中。
需要标题的段落在下面，这里是introduction。No matter how formal or informal the work environment, the way you present yourself has an impact. This is especially true in the first impressions. According to research from Princeton University, people assess your competence, trustworthiness, and likability in just a tenth of a second, solely based on the way you look.The difference between today’s workplace and the “dress for success” era is that the range of options is so much broader. Norms have evolved and fragmented. In some settings, red sneakers or dress T-shirts can convey status; in others not so much. Plus, whatever image we present is magnified by social-media services like LinkedIn. Chances are, your headshots are seen much more often now than a decade or two ago. Millennials, it seems, face the paradox of being the least formal generation yet the most conscious of style and personal branding. It can be confusing.So how do we navigate this? How do we know when to invest in an upgrade? And what’s the best way to pull off one that enhances our goals?Here are some tips:
Think of those fleeting moments when you look out of an aeroplane window and realise that you are flying, higher than a bird. Now think of your laptop, thinner than a brown-paper envelope, or your cellphone in the palm of your hand. Take a moment or two to wonder at those marvels. You are the lucky inheritor of a dream come true.The second half of the 20th century saw a collection of geniuses, warriors, entrepreneurs and visionaries labour to create a fabulous machine that could function as a typewriter and printing press, studio and theatre, paintbrush and gallery, piano and radio, the mail as well as the mail carrier. (1) ________The networked computer is an amazing device, the first media machine that serves as the mode of production, means of distribution, site of reception, and place of praise and critique. The computer is the 21st century’s culture machine.But for all the reasons there are to celebrate the computer, we must also act with caution. (2) ________ I call it a secret war for two reasons. First, most people do not realise that there are strong commercial agendas at work to keep them in passive consumption mode. Second, the majority of people who use networked computers to upload are not even aware of the significance of what they are doing.All animals download, but only a few upload. Beavers build dams and birds make nests. Yet for the most part, the animal kingdom moves through the world downloading. Humans are unique in their capacity to not only make tools but then turn around and use them to create superfluous material goods—paintings, sculpture and architecture—and superfluous experiences—music, literature, religion and philosophy. (3) ________For all the possibilities of our new culture machines, most people are still stuck in download mode. Even after the advent of widespread social media, a pyramid of production remains, with a small number of people uploading material, a slightly larger group commenting on or modifying that content, and a huge percentage remaining content to just consume. (4) ________Television is a one-way tap flowing into our homes. The hardest task that television asks of anyone is to turn the power off after he has turned it on. (5) ________What counts as meaningful uploading? My definition revolves around the concept of “stickiness”— creations and experiences to which others adhere.
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