题目内容
1.气相色谱法，就其操作形式而言属于（）
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2.气相色谱法按色谱原理不同可以分为（）
4.气相色谱法具有诸多优势，不恰当的说法是（）
气相色谱法中，可用于衡量柱效的参数是（）
Task 1 Read the passage. Write T (true) or F (false) for the statements.Black Friday is the Friday following Thanksgiving in the US. On this day, the Christmas shopping season begins and large stores all over the US have sales. Recently, Black Friday has been the busiest shopping day of the year in the US.The name “Black Friday” originated in Philadelphia where it was used to describe the heavy traffic in the city after Thanksgiving. Later, another explanation of the name was made. When a company loses money, we say it is “in the red” and when it makes money, it is “in the black”. So “Black Friday“has come”to symbolize the day when companies can start to make a big profit.Black Friday has caused some problems. In 2008, a crowd of 2000 shoppers were waiting outside a local Wal-Mart in New York. When the store opened, everyone rushed in and one person was killed in the crush. Due to incidents like this one, many people now do their Black Friday shopping online.. It is common for people to wait until Monday to do this because they can buy things online that do not sell over the weekend. This has led to a new name for the Monday after Thanksgiving-Cyber Monday.1.Black Friday is the Friday before Christmas.2.It is currently the busiest shopping day of the year in the US.3.The name “Black Friday” came from a song.4.Black Friday can be dangerous.5.Cyber Monday is the day when the computer shops all have big sales.
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