论文部分内容阅读
第二次世界大战以后,美国国防部对已购置的设备做了调查,发现它们的使用维修费用在五年内竟达到了购置费用的五倍。这一现象,促使人们开始意识到:应
After the Second World War, the U.S. Department of Defense investigated the purchased equipment and found that their use and maintenance costs had reached five times the purchase cost within five years. This phenomenon prompted people to begin to realize that: