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一般机械中滚动轴承使用最广的是（）
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规定滚动轴承单一内（外）径的极限偏差主要是为了（）
规定单一平面平均内（外）径的极限偏差主要是为了（）
Match each paragraph (A-F) to its main idea：请直接在空格内填大写字母即可，其他什么都不要填，例：D1 Paragraph_______ There are likely to be many more underground cities in Turkey that have not yet been found.2 Paragraph_______ Scientists don't know how old the city is, but it seemed to have enough resources for its people.3 Paragraph_______ A man in Turkey discovered something surprising beneath his house.4 Paragraph_______ The artifacts found in the city below Nevsehir helped scientists work out its age and purpose.5 Paragraph_______ The structure of the hidden city suggests that people used the underground city to hide from danger.6 Paragraph_______ Workers found an underground city in Turkey that was bigger than Derinkuyu.
Here is the overview of the reading "Secret Cities". Please fill in the suitable words from the text.The passage talks about how the giant underground city1__________ was discovered in 1963 in Cappadocia, Turkey, by an ordinary man renovating his2__________. The city is believed to have been a refuge for3__________ during attacks. It was thought to be the largest underground city in Cappadocia until 2013, when4__________ found an even bigger one in the city of Nevsehir.5__________ suggest that this second city is up to 5,000 years old. With more than 200 underground cities thought to exist in Cappadocia, it is likely that more will be6___________.
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