问题
多项选择题
航空公司的误机、变更收费单所起到的作用是（）。
A.收取客票运费
B.收取货物运费
C.当作国际航空运输时使用的MCO
D.当作退款单
E.当作CCA
答案
参考答案：C, D
搜题请搜索小程序“爱下问搜题”
航空公司的误机、变更收费单所起到的作用是（）。
A.收取客票运费
B.收取货物运费
C.当作国际航空运输时使用的MCO
D.当作退款单
E.当作CCA
参考答案：C, D
阅读下列短文，根据短文内容完成表格中所缺信息，每空一词。 Street Markets Around the World There are many ways of shopping. You can shop by telephone, by post or through your home computer, but for many people, the most exciting way to shop is also the most traditional—at a street market. You can find markets anywhere in the world. Here are four of them: There are many “floating markets” in Asia; perhaps the most unusual is Thailand(泰国), at a place called Damned Saduak. It’s open from six in the morning to the noon every day. People sell fresh fruit from their boats. Many Belgians(比利时人) say that the Grand Place is the most beautiful square in the world. It’s the home of a colourful flower market. It’s open every day except Monday. On Monday, instead of flowers, there’s a wonderful bird market. One of the world’s famous markets is in Mexico City(墨西哥城)—the Sonora Market. You can buy toys, birds, herbs and medicine. There’re all kinds of things. It’s open every day from early in the morning till late at night. In England, every weekend, thousands of young people from all over London travel to the Camden Market—it’s the place to go for street fashion, CDs and tapes. Many people also go there for fun. 根据以上内容，完成下列表格，每空一词
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的木块在质量为
的长木板上滑动，滑动过程中长木板始终处于静止状态。已知长木板与水平地面间的动摩擦因素为
，木块与长木板间的动摩擦因素为
，则长木板受到地面的摩擦力大小为（ ）