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考研考傷了金蟲 (正式寫手)
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[求助]
求助新GRE閱讀Excercise16的一道題 已有2人參與
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When a molten metal or metallic alloy is cooled to a solid, a crystalline structure is formed that depends on the particular alloy composition. In contrast, molten Line nonmetallic glass-forming materials, when cooled, do not 5 assume a crystalline structure, but instead retain a structure somewhat like that of the liquid--an amorphous structure. At room temperature, the natural long-term tendency for both types of materials is to assume the crystalline structure. The difference between the two is in 10 the kinetics or rate of formation of the crystalline structure, which is controlled by factors such as the nature of the chemical bonding and the ease with which atoms move relative to each other. Thus, in metals, the kinetics favors rapid formation of a crystal line structure, whereas 15 in nonmetallic glasses the rate of formation is so slow that almost any cooling rate is sufficient to result in an amorphous structure. 11. The author implies that the rate at which the molten materials discussed in the passage are cooled is a determinant of the (A) chemical composition of the resulting solids (B) strength of the chemical bonds that are formed (C) kinetics of the materials' crystalline structure (D) structure the materials assume (E) stability of the materials' crystalline structure 12. It can be inferred from the passage that, theoretically, molten nonmetallic glasses assume a crystalline structure rather than an amorphous structure only if they are cooled (A) very evenly, regardless of the rate (B) rapidly, followed by gentle heating (C) extremely slowly (D) to room temperature (E) to extremely low temperatures 第11題,文章第一句話不是說depends on the particular alloy composition,為什么不是A,要選E 第12題,文章只是說金屬生成晶體速率要快,但非金屬在任何較慢的速率都能生成非晶體,可是題目問的是非金屬在什么條件下能產(chǎn)生晶體,請問這能推出來嗎? |
金蟲 (正式寫手)
金蟲 (正式寫手)
金蟲 (正式寫手)
木蟲 (著名寫手)
A thinking worm
金蟲 (正式寫手)
木蟲 (著名寫手)
A thinking worm
金蟲 (正式寫手)
木蟲 (著名寫手)
A thinking worm
木蟲 (正式寫手)

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