就一道题！！

linlin315 · 发表于 2003-7-26 21:06:00

No one can be licensed as an electrician in Parker County without first completiong a certain course in electrical safety procedures. All students majoring in computer technology at Parker County Technical College must complete that course before graduating. Therefore, any of the college's graduates in computer technology can be licesed as an electrician in Parker County.
The reasoning in the argument above is open to question because the argument has not estalished that
A. everyone who has completed the course in electrical safety procedures is equally knowledgeable about such procedures
B. all students majoring in computer technology who complete the course in electrical safety procedures at Parker County Technical College eventually graduate
C. completion of a course in electrial safety procedures is all that is necessary for a person to be licensed as an electrician in Parker County
D. the only way for a person to become knowledgeable about electrical safety procedures is to take a course in those procedures
E. the only students at Parker County Technical College who are eligible to take the course in electrical safety procedures are majoring in computer technology
答案是C
我的问题是题中的第一句话推理是：获得电工证书---->完成课程
第二句是：毕业学生--->完成课程
而结论是：毕业学生--->获得电工证书
所以前提和结论之减少了个桥梁：必须有完成课程--->获得电工证书成立,那么完成课程应该是充分条件才对，而C中说是必要条件，不明白怎么回事，谢了！！

siebel · 发表于 2003-7-26 22:21:00

C：完成--〉得证书
c是充分条件吧？
A is all that is necessary for B. 意思：a是b所要求的所有条件。不晓得对不对？

tocean0222 · 发表于 2003-7-26 23:05:00

The arguement just claims that “completion such a course” is inevitable for a person to be licenced as an electrician, but not that this condition is sufficient for a gratuate to get an electrician licence, as stated in C--"completion of a course is all that is necessary...".You may wrongly understand the sentence: "No one can be licensed as an electrician in Parker County without first completiong a certain course", which does not mean that people who complete this course can definitely get the licence.

[此贴子已经被作者于2003-7-26 23:07:52编辑过]

小米 · 发表于 2003-7-27 10:31:00

Agree with Siebel ~~
A is all that is necessary for B. = A -->B
A is necessary to B. = A<--B

linlin315 · 发表于 2003-7-27 17:30:00

明白！！！谢谢大家！！

linlin315 · 发表于 2003-7-27 17:32:00

了得小米！！兔兔现在正在总结像这种necessary for ,necessary to充分，必要条件的标志词，谢谢！！以后多多请教，呵呵，叩谢ing......

以下是引用小米在2003-7-27 10:31:00的发言：
Agree with Siebel ~~
A is all that is necessary for B. = A -->B
A is necessary to B. = A<--B

小米 · 发表于 2003-7-28 11:45:00

别 LINLIN~~~这是讹应该做的，只是把讹的想法说出来吧，要是错了，千万别THROW EGG ：-）
我不知道机考逻辑题会怎样，我觉得做GMAT真题时真正对充分必要条件的来回折腾考的题好象没有：-））

QY · 发表于 2003-7-28 15:19:00

From another angle,the answer must exist at the nexus between a certain course in electrical safety procedures and electrician.

linlin315 · 发表于 2003-7-28 19:29:00

我怎么觉得在归纳题里很多题考的都是充分于必要的推理关系和命题间的关系呢？我做的也是gmat真题。那小米你做归纳题的时候是怎么做的呢啊？？请教ing，呵呵！！

以下是引用小米在2003-7-28 11:45:00的发言：
别 LINLIN~~~这是讹应该做的，只是把讹的想法说出来吧，要是错了，千万别THROW EGG ：-）
我不知道机考逻辑题会怎样，我觉得做GMAT真题时真正对充分必要条件的来回折腾考的题好象没有：-））

linlin315 · 发表于 2003-7-28 19:30:00

对了！！！小米你啥时考了呀？？我8月29号考

就一道题！！

就一道题！！

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