What brings trouble to fast food industry?
A.Customers' demand and competition with retailers.
B.The aging baby-boomer and diversity of food.
C.Competition with retailers and diversity of food.
D.Customers' demand and the aging of baby-boomer.
第6题
A.10-16次/分,8-10L/min
B.10-16次/分,10-15L/min
C.8-12次/分,8-10L/min
D.10-14次/分,10-15L/min
E.12-16次/分,8-10L/min
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