tpo 7 integrated writing

本文探讨了生态认证对美国木材企业的三个关键价值:消费者更信任独立机构的生态认证;当价格差异小于5%时,消费者会考虑生态认证等因素;国际竞争压力促使企业必须关注生态认证,以保持市场竞争力。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

Now listen to part of a lecture on the topic you just read about.

 

Well, despite what many people say, there's good reason to think that many American wood companies will eventually seek ecocertification for their wood products.

 

First off, consumers in the United States don't treat all advertising the same. They distinguish between advertising claims that companies make about their own products and claims made by independent certification agencies. Americans have a lot of confidence in independent consumer agencies. Thus, ecologically minded Americans are likely to react very favorably to wood products ecologically certified by an independent organization with an international reputation for trustworthiness.

 

Second point—of course it's true that American consumers care a lot about price—who doesn't? But studies of how consumers make decisions show that price alone determines consumers' decisions only when the price of one competing product is much higher or lower than another. When the price difference between two products is small—say, less than five percent, as is the case with certified wood—Americans often do choose on factors other than price. And Americans are becoming increasingly convinced of the value of preserving and protecting the environment.

 

And third, U.S. wood companies should definitely pay attention to what's going on in the wood business internationally, not because of foreign consumers, but because of foreign competition. As I just told you, there's a good chance that many American consumers will be interested in ecocertified products. And guess what, if American companies are slow capturing those customers, you can be sure that foreign companies will soon start crowding into the American market, offering ecocertified wood that domestic companies don't.

 

The professor in the listening holds the eco-certification is necessary.

 

First, there are different kind of advertisement in America. Consumers in America, may not value the advertisement provided by private companies. However, the ecocertification information offered by professional agency advertisement would draw people's attention. And eventually, the consumers would really pay attention to whether a specific wood company has that certification.

 

Secondly, consumers would concern about whether a company has ecocertificatoin when two companies' price difference is less than 5 percent. So, if the different of price not big enough, consumers actually would take other factors into consideration like the ecocertification rather than only care about the slight money they can save.

 

Thirdly, it is the competitions with board not who to sell that matters. If the American companies don't have such ecocertification when companies from aboard have, consumers in America would very like to choose aboard products because of the ecocertification. So, even though American consumers are the people for who the American wood companies target, it is still necessary for American wood companies to get ecocertification in order to save the market benefits despite the fact they don't need to concern about aboard comsumers.

 

So, ecocertification is of paramount importance to American wood companies.

资源下载链接为: https://pan.quark.cn/s/9e7ef05254f8 行列式是线性代数的核心概念,在求解线性方程组、分析矩阵特性以及几何计算中都极为关键。本教程将讲解如何用C++实现行列式的计算,重点在于如何输出分数形式的结果。 行列式定义如下:对于n阶方阵A=(a_ij),其行列式由主对角线元素的乘积,按行或列的奇偶性赋予正负号后求和得到,记作det(A)。例如,2×2矩阵的行列式为det(A)=a11×a22-a12×a21,而更高阶矩阵的行列式可通过Laplace展开或Sarrus规则递归计算。 在C++中实现行列式计算时,首先需定义矩阵类或结构体,用二维数组存储矩阵元素,并实现初始化、加法、乘法、转置等操作。为支持分数形式输出,需引入分数类,包含分子和分母两个整数,并提供与整数、浮点数的转换以及加、减、乘、除等运算。C++中可借助std::pair表示分数,或自定义结构体并重载运算符。 计算行列式的函数实现上,3×3及以下矩阵可直接按定义计算,更大矩阵可采用Laplace展开或高斯 - 约旦消元法。Laplace展开是沿某行或列展开,将矩阵分解为多个小矩阵的行列式乘积,再递归计算。在处理分数输出时,需注意避免无限循环和除零错误,如在分数运算前先约简,确保分子分母互质,且所有计算基于整数进行,最后再转为浮点数,以避免浮点数误差。 为提升代码可读性和可维护性,建议采用面向对象编程,将矩阵类和分数类封装,每个类有明确功能和接口,便于后续扩展如矩阵求逆、计算特征值等功能。 总结C++实现行列式计算的关键步骤:一是定义矩阵类和分数类;二是实现矩阵基本操作;三是设计行列式计算函数;四是用分数类处理精确计算;五是编写测试用例验证程序正确性。通过这些步骤,可构建一个高效准确的行列式计算程序,支持分数形式计算,为C++编程和线性代数应用奠定基础。
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值