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  3. Japanese firms have achieved the highest levels of manufacturing efficiency in the world auto mobile industry. Some observers of

Japanese firms have achieved the highest levels of manufacturing efficiency in the world auto mobile industry. Some observers of

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问题     Japanese firms have achieved the highest levels of manufacturing efficiency in the world auto mobile industry. Some observers of Japan have assumed that Japanese firms use the same manufacturing equipment and techniques as United States firms but have benefited from the unique characteristics of Japanese employees and the Japanese culture. However, if this were true, then one would expect Japanese auto plants in the United States to perform no better than factories run by United States companies. This is not the case. Japanese-run automobile plants located in the United States and staffed by local workers have demonstrated higher levels of productivity when compared with factories owned by United States companies.
     Other observers link high Japanese productivity to higher levels of capital investment per worker. But a historical perspective leads to a different conclusion. When the two top Japanese automobile makers matched and then doubled United States productivity levels in the mid-sixties, capital investment per employee was comparable to that of United States firms. Furthermore, by the late seventies, the amount of fixed assets required to produce one vehicle was roughly equivalent in Japan and in the United States. Since capital investment was not higher in Japan, it had to be other factors that led to higher productivity.
     A more fruitful explanation may lie with Japanese production techniques. Japanese automobile producers did not simply implement conventional processes more effectively; they made critical change in United States procedures. For instance, the mass-production philosophy of United States automakers encouraged the production of huge lots of cars in order to utilize fully expensive, component-specific equipment and to occupy fully workers who have been trained to execute one operation efficiently. Japanese automakers chose to make small-lot production feasible by introducing several departures from United States practices, including the use of flexible equipment that could be altered easily to do several different production tasks and the training of workers in multiple jobs. Automakers could schedule the production of different components or models on single machines, thereby eliminating the need to store the spare stocks of extra components that result when specialized equipment and workers are kept constantly active.
The spare stocks of extra components have to be stored when ______ is used.
选项
答案specialized equipment
解析 末段末句中when引出的时间状语从句表明了在什么条件下需要储存部件作为备用件，文中提到的两个条件，只有前一个条件，即specialized equipment，可以成为空白处后的单数动词is used的主语，因此specialized equipment为本题答案。
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