Certain instruments used in veterinary surgery can be made either of stainless stell or of nylon. In a study of such instruments, 50 complete sterilizaions of a set of nylon instruments require 3.4 times the amount of energy used to manufacture that set of instruments, whereas 50 complete sterilizations of a set of stainless steel instruments required 2.1 times the amount of enrgy required to manufacture that set of instruments.
If the statements above are true, each of the following could be true EXCept: A. The 50 complete sterilizations of the nylon instruments used more energy than did the 50 complete sterilizations of the stainless steel instruments B. More energy was required for each complete sterilization of the nylon instruments than was required to manufacture the nylon nstruments C. More nylon instruments than stainless steel instruments were sterilized in the study. D. More energy was used to produce the stainless steel instruments than wasx used to produce the nylon instruments. E. The total cost of 50 complete sterilizations of the stainless steel instuments was greater than the cost of manufacturing the stainless steel instruments.
答案是B 可是我左看右看，好像只有B最像是could be true的。不是吗？消毒Nylon不是要生产Nylon能量的2.1倍么？至于消毒/生产Nylon or Steel的能量如何比较，无从可知。 谢谢！
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2007-10-13 03:21:00
楼主
