It can be inferred from Paragraph 1 that
A. Joseph Juran came up with Six Sigma based on his statistical work.
B. Six Sigma is an approach to improving quality to total perfection.
C. mathematicians and statistical experts master Six Sigma best.
D. Six Sigma quality is relatively better than Four Sigma quality.
P50钢轨的轨底宽度为（）mm。
A. 114
B. 132
C. 150
D. 155
行政管理能力、员工培养能力、团队建设能力、规划和沟通能力等，是个体在职业发展过程中必须培养的能力要素，它们是实现职业发展的重要工具，也是职业发展的目标。()
The underlined word "they" in Paragraph 3 refers to
A. the Green Belts.
B. the Black Belts.
C. the Master Black Belts.
D. the team leaders.
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