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公文的正本最突出的特点是盖有发文机关的印章或领导人的亲笔签署，以证实文件的效力。
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Directions: The passage below is followed by questions based on its content. Once you have read the passage, select the answer choice that best answers each question. Answer all questions on the basis of what is stated or implied in the passage. For each of Questions 17-20, select one answer choice unless otherwise instructed. Questions 17-18 are based on the following passage. The stability that had marked the Iroquois Confederacy’s generally pro-British position was shattered with the overthrow of James IILine in 1688, the colonial uprisings that followed (5) in Massachusetts, New York, and Maryland, and the commencement of King William’s War against Louis XIV of France. The increasing French threat to English hege- mony in the interior of North America was (10) signalized by French-led or French-inspired attacks on the Iroquois and on outlying colonial settlements in New York and New England. The high point of the Iroquois response was the spectacular raid of August (15) 5, 1689, in which the Iroquois virtually wiped out the French village of Lachine, just outside Montreal. A counter-raid by the French on the English village of Schenectady in March 1690 instilled an appropriate (20) measure of fear among the English and their Iroquois allies. The Iroquois position at the end of the war, which was formalized by treaties made during the summer of 1701 with the British (25) and the French, and which was maintained throughout most of the eighteenth century, was one of "aggressive neutrality" between the two competing European powers. Under the new system the Iroquois initiated a peace (30) policy toward the "far Indians," tightened their control over the nearby tribes, and induced both English and French to support their neutrality toward the European powers by appropriate gifts and concessions. The author’s primary purpose in this passage is to
归档文件的整理工作，应由档案部门完成。
Questions 10-11 are based on the following passage. According to the theory of plate tectonics, the lithosphere (earth’s relatively hard and solid outer layer consisting of the crust andLine part of the underlying mantle) is divided (5) into a few dozen plates that vary in size and shape; in general, these plates move in rela- tion to one another. They move away from one another at a mid-ocean ridge, a long chain of sub-oceanic mountains that forms a (10) boundary between plates. At a mid-ocean ridge, new lithospheric material in the form of hot magma pushes up from the earth’s interior. The injection of this new lithos- pheric material from below causes the phe- (15) nomenon known as sea-floor spreading. Given that the earth is not expanding in size to any appreciable degree, how can "new" lithosphere be created at a mid-ocean ridge For new lithosphere to come into (20) being in one region, an equal amount of lithospheric material must be destroyed somewhere else. This destruction takes place at a boundary between plates called a sub- duction zone. At a subduction zone, one (25) plate is pushed down under another into the red-hot mantle, where over a span of mil- lions of years it is absorbed into the mantle. It can be inferred from the passage that as new lithospheric material is injected from below
在以下几种情况的机关之间，因工作需要往来公文，可以使用平行文的有______
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