单项选择题

A company's weekly costs ($C) were plotted against production level (P) for the last 50 weeks and a regression line calculated to be C = 1,000 + 250P. Which statement about the breakdown of weekly costs is true? ( )

A．Fixed costs are

5.
B．Fixed costs are

4.
C．Fixed costs are

1,000.
D．Fixed costs are

250

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答案：先进先出

不定项选择

安溪铁观音的销售渠道主要有茶农直销，批发市场、零售、连锁经营、超市、电子商务。

A．错误
B．正确