关于中频电疗法生物学效应叙述不正确的是（）

A.中频电对人体的作用深度大于低频电

B.中频电流对神经肌肉的兴奋作用不明显

C.中频交流电通过人体时人体的电阻和容抗都低于低频电

D.有的患者在中频电疗后出现的组织损伤，可能是因电解所致的电烧伤

E.有的患者在中频电疗后出现的组织损伤，可能是因电流密集于局部产生的热烫伤

An analysis determined that approximately 99 percent of the observations of daily sales for a company were within the interval from $ 250000 to $ 580000 and that daily sales for the company were normally distributed. The mean daily sales and standard deviation of daily sales, respectively, for the company were closest to: Mean daily sales Standard deviation of daily sales（）

A. $ 415000 $ 41667

B. $ 415000 $ 55000

C. $ 355115 $ 41667