市场细分的实质是细分产品，而不是细分消费者。
参考答案：错
若A={1，4，x}，B={1，x2}，且A∩B=B，则x=（ ）
A．2
B．±2
C．2、-2或0
D．2、-2、0或1
Which word of the following doesn't have the same stress as the others?
A. Spanish B. Accept C. Repeat
