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为了防止涡轮壳体电化学腐蚀，除用淡水冷却外，可以采用（）等方法。Ⅰ.壳体表面覆盖保护膜；Ⅱ.阴极保护；Ⅲ.阳极保护；Ⅳ.淡水中加防腐剂；Ⅴ.安装防腐锌块。
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统一交货定价就是我们通常说的＿＿＿＿＿＿＿＿定价。
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建筑安装工程费中的税金是指（）。
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应用冬虫夏草的免疫抑制作用可治疗（）（）
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人寿保险和火灾保险均起源于中世纪欧洲的基尔特制度。
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一种知识技能的掌握促进了另一种知识技能的掌握，称之为（）.从其他事物中看出解决问题的途径和方法，称之为（）
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Every country has traffic rules and signs, but are they the same? In most countries, there are street and road signs with 21________ about location,directions,dangers,cautions, and rules of the road. These 22 _________ tell drivers and pedestrians what to do and what not to do,including speed and parking 23 ________,places to stop,when to make turns,and other 24________.However, specific local traffic laws and practices usually differ around the world. For instance, in Japan, Indonesia, South Africa, the United Kingdom, and other countries ,steering 25________are on the right side of vehicles ,and cars and trucks drive on the left side of the road. In other 26 _________,such as the United States,Saudi Arabia,Italy, and Mexico,steering wheels are on the left side of vehicles ,and cars and trucks 27________on the right side of the road. An illustration of a local 28________law is the regulations for pedestrian and school 29 ________ in some Mexican cities:drivers rarely respect the rules,so for safety, people cross streets only at stop lights, on roads with little traffic, or on pedestrian-only 30 _________ across wide avenues.
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照国家规定，轿车现分为微型、普通、中级、中高级和和高级5个级别。我国的分类方法是按照什么标准排的？
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试述鼻咽癌的临床表现和治疗原则。
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椎一基底动脉供血不足的TCD主要表现为