题目

小明在观看新型冠状病毒疫情相关新闻时发现隔离病房内非常需要无接触式送餐服务。因此想设计一款机械手，以帮助完成送餐。小王的已设计好如图所示的结构，活塞杆可以在机架杆的导孔中上下运动，抓手与机架杆采用铰连接，负责完成食品袋的抓取与放置。请帮助小王完成抓手和活塞杆的连接件设计，实现食品袋的抓取功能。设计要求如下： A.连接件安装在活塞杆与抓手间，活塞杆向上运动时，抓手具有抓取食品袋；向下运动时，抓手释放； B    Nowadays，it is common to see 5-gallon bottles of water being sent to homes. Supermarket  shelves are filled with all kinds of bottled water from simple plastic bottles containing “pure spring water” to expensive foreign types of mineral water in glass bottles. In Europe，bottled water is as popular as soft drinks are in the USA．People are not only interested in the different choices of drinks，but also in the taste of bottled water and its health value.    All bottled water must list the content of the water on the bottle. Some companies mix minerals together to give the water a better taste．But the term mineral water is misleading， because an water―except specially purified water―contains minerals. Law must be made to tell people clearly what kind of water people are exactly buying：spring water, mineral water, or purified water．For example，“spring water” will have to come from the underground spring.    Many people choose bottled water over tap water，because they doubt the safety of public drinking water．Some people worry about city water supplies．We need to pay close attention to the cleanliness of our drinking water．The government should be responsible for tap water quality. It should be tested and checked regularly．    Keep in mind that bottled water is expensive．In many rases，you are paying for water that is not much different from tap water．If you are not sure of the safety of your tap watter，have it  tested．A local health department can be of service．Compared with the cost of bottled water，the testing cost will be less expensive．Letting cold water run for a minute or so before taking a drink or using it in preparing a meal is a good way to limit possible water pollution, especially if the water has been off for an hour or more．56．What is the best title of the passage? (No more than 10 words)                                                                                57．According to the passage，what kind of water doesn't contain minerals? (No more than 5 words)                                                                                58．Why do people prefer bottled water to tap water? (No more than 10 words)                                                                                59．Please explain the underlined phrase“keep in mind”in English． (No more than 5 words)                                                                                60．If you don't think tap water is safe enough，what can you do? (No more than 20 words)