2. 职称英语
  3. Steel is valued for its reliability, but not when it gets cold. Most forms of

Steel is valued for its reliability, but not when it gets cold. Most forms of

游客2024-03-11  0
问题    Steel is valued for its reliability, but not when it gets cold. Most forms of steel【C1】______become brittle (脆的) at temperatures below about -25℃ unless they are mixed with other metals. Now, though, a novel type of steel has been developed that resists【C2】______at much lower temperatures, while retaining its strength and toughness—without the need for expensive【C3】______.
   Steel’s fragility at low temperatures first became a major concern during the Second World War. After German U-boats torpedoed (用鱼雷攻击) numerous British ships, a 2,700-strong fleet of cheap- and-cheerful "Liberty ships" was introduced to replace the lost vessels, providing a lifeline for the【C4】______British. But the steel shells of hundreds of the ships【C5】______in the icy north Atlantic, and 12 broke in half and sank.
   Brittleness remains a problem when building steel structures in cold conditions, such as oil rigs in the Arctic. So scientists have【C6】______to find a solution by mixing it with expensive metals such as nickel.
   Yuuji Kimura and colleagues in Japan tried a more physical【C7】______. Rather than adding other metals, they developed a complex mechanical process involving repeated heating and very severe mechanical deformation, known as tempforming.
   The resulting steel appears to achieve a combination of strength and toughness that is【C8】______to that of modern steels that are very rich in alloy content and, therefore, very expensive.
   Kimura’s team intends to use its tempformed steel to make ultra-high strength parts, such as bolts. They hope to reduce both the number of【C9】______needed in a construction job and their weight—by replacing solid supports with【C10】______tubes, for example. This could reduce the amount of steel needed to make everything from automobiles to buildings and bridges.
   A) abruptly I) cracked
   B) additives J) fractures
   C) approach K) hollow
   D) ardently L) relevant
   E) besieged M) reshuffled
   F) channel N) strived
   G) comparable O) violent
   H) components [br] 【C2】
选项
答案 J
解析 名词辨析题。空格位于一个定语从句中，空格前的that指代主语a novel type of steel，resists是谓语动词，空格后是介词短语at much lower temperatures作状语，因此，空格处需要填入名词形式作定语从句中resists的宾语。上文提到，大多数钢在温度低于大约零下25℃时会突然变脆，短文最后两段提到，木村勇次及其同事研发出了一种新型的钢，使其达到强度和韧性的结合，因此，此处是说这种新型的钢已经被开发出来，它可以在更低温度下抵抗断裂。由此可以确定名词J)fractures“破裂，断裂”为本题答案。备选的其他名词均与此处要表达的“断裂”或“破裂”意思不符，均可排除。
转载请注明原文地址:https://tihaiku.com/zcyy/3524904.html
相关试题推荐
随机试题
最新回复(0)