Which of the following examples is talking about heterogeneity? _________
A.airport X ray surveillance equipment has replaced human collectors
B.Automatic car washes have replaced the uneven quality of hand washing, waxing and drying
C.Allstate Insurance Company’s use of the “good hands” symbol helps make tangible the bend it of production
D.When the cast member are hired, Disney will make they spend the first day on the job at “Disney University” learning about the Disney philosophy
正确答案是AB