GWD 7-27.

A significant number of complex repair jobs carried out by Ace Repairs have to be reworked under the company's warranty. The reworked jobs are invariably satisfactory. When initial repairs are inadequate, therefore, it is not because the mechanics lack competence; rather, there is clearly a level of focused concentration that complex repairs require that is elicited more reliably by rework jobs than by first-time jobs.

The argument above assumes which of the following?

A. There is no systematic difference in membership between the group of mechanics who do first-time jobs abd the group of those who do rework jobs.

B. There is no company that successfully competes with Ace Repairs for complex reapir jobs.

C. Ace Repairs's warranty is good on first-time jobs but does not cover rework jobs.

D. Ace Repairs does not in any way penalize mechanics who have worked on complex repair jobs that later had to be reworked.

E. There is no category of repair jobs in which Ace Repairs invariably carries out first-time jobs satisfactorily.

The answer is A. Why?

谢谢，

结论说initial repairs are inadequate,是因为更信任rework,所以不是工人水平的问题.

如果两次工作的工人水平有很大差异,那么结论不成立.

所以A.