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ALBERT看过来
17. Certain instruments used in veterinary surgery can be made either of stainless steel of nylon. In a study of such instruments, 10 complete sterilizations of a set of nylon instruments required 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 time the amount of energy 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 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 instruments.
(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 was used to produce the nylon instruments.
(E) The total cost of 50 complete sterilizations of the stainless steel instruments was greater than the cost of manufacturing the stainless steel instruments.
答案:B
这两题, 我真是一点头绪也没有.请教思路.谢谢.
你的解答如下：
sorry...
17看错题目
B比较的是： NYLON消毒和制造时间。
10 * 消毒时间 = 2.1 * 制造时间
所以消毒时间< 制造时间。。 所以B的表达和原文是不符合的。。。 而题目是要求选NOT TRUE的， 所以B
我的想法：
ALBERT，
3.4* A, A:the amount of energy used to manufacture that set of nylon instruments
2.1 * B: B:the amount of energy required to manufacture that set of stainless instruments
而且文中并没有出现等式，A并不一定等于B啊，所以结论如何得的？
能不能再讲讲？谢谢。
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发表于 2003-6-7 16:14:00
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