题目六西格玛水平对应的缺陷率是A. 340 ppmB. 3.4 ppmC. 3400 ppmD. 34 ppm六西格玛水平对应的缺陷率是A. 340 ppmB. 3.4 ppmC. 3400 ppmD. 34 ppm题目解答答案B. 3.4 ppm