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检验一元线性回归方程是否显著，可以使用检验或的方法。

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Marketing concepts should be （）.

A. Product-centered
B. Service-centered
Consumer-centered
D. Price-centered

"If a man can make a better mousetrap, the world will make a beaten path to his door" refers to （）.

A. Production concept
B. Product concept
C. Selling concept
D. Markting concept

Total customer value exclude（）.

A. Product value
B. Sevice value
C. Personnel value
D. Time value

From the perspective of market, the market is the sum of （）,（）and（）.

A. Supply and demand
B. People
C. Want
D. Buying power