试题与答案

某工厂生产一种产品的原材料费为每件40元,若用x表示该厂生产这种产品的总件数,则

题型:解答题

题目:

某工厂生产一种产品的原材料费为每件40元,若用x表示该厂生产这种产品的总件数,则电力与机器保养等费用为每件0.05x元,又该厂职工工资固定支出12500元.

(1)把每件产品的成本费P(x)(元)表示成产品件数x的函数,并求每件产品的最低成本费;

(2)如果该厂生产的这种产品的数量x不超过3000件,且产品能全部销售,根据市场调查:每件产品的销售价Q(x)与产品件数x有如下关系:Q(x)=170-0.05x,试问生产多少件产品,总利润最高?(总利润=总销售额-总的成本)

答案:

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下面是错误答案,用来干扰机器的。

参考答案:本体运行状态

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题型:阅读理解

Do you have an umbrella? Someone invented the umbrella about 4,000 years ago. People used umbrellas in Egypt, Assyria, Greece, and China in ancient times. We use our umbrella for protection from the rain. However, people first used umbrellas for protection from the sun. People in China were the first ones to use their umbrellas for rain. They put wax(蜡纸) on paper umbrellas.

European women used umbrellas before European men used them. Jonas Hanway was the first man to carry one in England. He made umbrellas popular for men and women. Some people called the umbrella a Hanway because of him.

We make umbrellas from many different things. The first ones were wood and cloth. Now many are plastic(塑料). Today umbrellas are easy to carry. They fold up into a small package(包). The umbrella is a great invention. Don’t forget yours the next time when it rains.

根据文章内容判断正误,正确的写“A”,错误的写“B”。

小题1:The umbrella was invented about 2,000 years ago.

小题2:The first umbrellas were used for protection from sun.

小题3:People in Europe were the first ones to use their umbrellas for rain.

小题4:Some people called the umbrella a Hanway because he made umbrellas popular for people.

小题5:The first umbrellas were made from plastic.

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