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某企业生产某种产品所需用的一种零件，若外购，其单价随采购量的变化而变动。当采购量在5 000件以下，每单位外购价为1.75元，当采购量超过5 000件，每单位的外购价为1.40元。若自行制造，每单位变动成本为0.9元，每年追加固定成本4 000元。要求：对该企业应自制或是外购该零件做出决策分析。

答案

参考答案：设X代表某零件需用量在5 000件以下自制与外购的成本平衡点。Y代表该零件在5 000件以上自制与外购的成本平衡点。（1分）据题意建立方程4 000+0.9X＝1.75X（1分）4 000+0.9Y＝1.4Y（1分）解得X=4 706件Y＝8 000件（1分）当需用量在5 000件以内，小于4 706件宜外购，大于4 706件宜自制。（1分）当需用量在5 000以上，从5 000件到8 000件宜外购，大于8 000件宜自制。（1分）

多项选择题

家庭教育具有的特点有()。

A．权威性

B．个别性

C．针对性

D.终身性

E.潜在性
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单项选择题

Skilled blacksmiths who could forge useful items out of iron used to play a central role in American life. The onset of industrialization and the mass production of iron products, however, have made the blacksmith’s traditional role mostly obsolete. Still, there will always be a job available for a good blacksmith.
Which of the following, if true, provides the most support for the conclusion that a job will always be available for a good blacksmith ？（）

A. Many people are willing to pay considerably more for tools hand-crafted by a blacksmith than for tools created by a machine.

B. Blacksmiths cannot produce iron products with the speed or consistency of machines.

C. Blacksmiths traditionally apprenticed to a master blacksmith for seven or more years before entering business independently.

D. The cowboy never would have conquered the West without the horseshoes crafted by blacksmiths.

E. As skilled craftsmen, blacksmiths traditionally served as community leaders throughout North America and Europe.
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