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学习Photoshop主要还是应用，不同的图片素材、不同的效果要求，是需要通过结合不同的工具和命令来实现的，“条条大路通罗马”，未必有非常严格固定的操作步骤和严格的参数。
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Lesson 8 背景知识选择-1ILS is considered to be the easiest instrument approach to fly because it offers vertical guidance through __________ and lateral guidance through ___________ as well as range guidance through markers.
Lesson 8 背景知识选择-2There are three categories of instrument approach procedures:_______with course and glide path guidance ,approach with vertical guidance(APV), and ________without glide path information
Lesson 8 背景知识选择-3Fuel dumping(or afuel jettison) is a procedure used by aircraft to ________in certain _________ situationswhen they have to________ for landing shortly after takeoff or they have to land_________ of the intended destination airport.
Lesson 8 背景知识选择-4Fuel-dumping operations are ________withair traffic control, and precautions are taken to keep other aircraft _______ of such areas. Fuel dumping is usually accomplished at a high enough altitude (minimum 6,000 feet,AGL), where the fuel will ________before reaching the ground.
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