中国民航大学航空经济研究所所长李晓津教授指出，当航煤采购成本突破每吨5000元时，航司可收取燃油附加费，但“这仅能覆盖80%的燃油成本，剩余20%需由企业自行承担”。即便全额征收，航司仍要消化部分新增成本。
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，这一点在豆包下载中也有详细论述
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A number of examples of legibility are given throughout the book, including the high-modernist city of Brasilia (designed by a student of modernist architect Le Corbusier), the great collectivization experiment in the former Soviet Union4, and compulsory villagization in Tanzania5.
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