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某企业A产品安全库存为20单位，需求量的期望值为100单位／月，单位货物的每月存储费为0.5元／单位·月，订货提前期的期望值为6天，每次订货费为100元。请计算货物A的最佳订购批量、最小库存总费用和订货点。

答案

参考答案：

（1）由题意可知：

A产品的年需求量D＝100×12＝1200（单位）；

单位货物年持有成本K＝0.5×12＝6（元）；

又C＝100元／次，则

经济订购批量；

最小库存总费用TC＝使库存总费用最小的订货批量（经济订货批量）×持有成本＝200×6＝1200（元）。

（2）由题可知，需求速度Rd＝100/30单位／天，平均交货期L＝6天，安全库存量S＝20单位，则

。

即货物A的最佳订购批量为200单位，最小库存总费用为1200元，订货点为40单位。

单项选择题

酰胺与次卤酸钠的碱溶液共热时发生脱出CO2转变为伯胺的反应，称为（）。

A、取代反应

B、水解反应

C、霍夫曼（Hoffmann）降解反应

D、还原反应
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单项选择题

Deflation is an economic theory relating changes in the price levels to changes in the quantity of money. In its developed (1) , it constitutes an analysis of the (2) underlying inflation and deflation. As (3) by the English philosopher John Locke in the 17th century, the Scottish (4) David Hume in the 18th century, and (5) , it was a weapon (6) the mercantilists, who were thought to equate wealth with money. If the (7) of money by a nation merely raised (8) , argued the quantity theorists, then a "favourable" balance of trade, (9) desired by mercantilists, would increase the supply of money but would not in-crease (10) . In the 19th century the quantity theory (11) to the ascendancy of free trade over protectionism. In the 19th and 20th centuries it played a part in the (12) of business cycles and in the theory of foreign (13) rates.

The (14) theory came under attack during the 1930s, (15) monetary expansion seemed ineffective in combating deflation. Economists argued that the levels of investment and government spending were more important than the money supply in determining economic activity.

The tide of opinion (16) again in the 1960s, when experience (17) post-World WarⅡ inflation and new empirical (18) of money and prices— (19) A Monetary History of the United States (1963) by Milton Friedman and Anna Schwartz—restored much of the quantity theory’ s lost prestige. One implication of this theory is that the size of the stock of money must be considered when shaping governmental policies (20) to control prices and maintain full employment.

2（）

A.causes

B.factors

C.facts

D.parts
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