根据网考网和考试题库的统计分析，以下试题在2014-12-1日PMP选择题习题练习中，答错率较高，为：87%
the use of quality circles:
a. has proven ineffective in both japan and the u.s.
b. is particularly effective in overcoming labor/management conflicts.
c. provides a quick fix for most quality problems.
d. allows workers the opportunity to generate solutions for chronic quality problems.
e. a and b only
参考答案：D，答错率：87%
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