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50901
Entrepreneurs typically stay their charted courses rather than cater to changing situations.
50902
As someone who has identified a business opportunity and assumed the risk of creating and running a business to take advantage of it, Sarah is an entrepreneur.
50903
A ()is considered a blueprint for a company.
50904
Which of the following questions is addressed in the business plan section entitled “Description of Proposed Business”?
50905
Lisa wants to be certain she has done all she can do to help her business survive, so she has written a business plan. One advantage of developing the plan is that it ()。
50906
A small business that buys goods from other firms and sells them to consumers is known as a ()。
50907
Many small firms provide ()services to large firms—that is, they hire themselves out to help with special projects or to handle certain business functions.
50908
Which of the following is among the disadvantages of small business ownership?
50909
As a business owner, you’re in charge and can decide when and where you want to work. This managerial freedom best reflects the ()advantage of small business ownership.
50910
As a business owner, you’re responsible for making the decisions that pertain to the profitability of your business. This decision-making freedom best reflects the ()advantage of small business ownership.
50911
Which of the following is among the rewards of being a small business owner?
50912
According to the Small Business Administration, one of the most common reasons for starting a business is to ()。
50913
While many ()ventures are based on innovative ideas, others revolve around improvements to existing goods or services.
50914
()are creative people who sometimes take risks.
50915
The three goals shared by all of the world’s economies are growth, high employment, and price stability.
50916
Legal monopolies exist in industries requiring huge investments and in which it would be inefficient to duplicate the products that they provide.
50917
Generally speaking, economic systems can be divided into planned and free market systems.
50918
The equilibrium price is a point at which buyers’ demand for a product and sellers’ supply of it are in balance.
50919
Perfect competition exists when many consumers are buying standardized products from a few small businesses.
50920
In an oligopoly, each seller supplies a large portion of all the products sold in the marketplace.
50921
Economists study the interactions between households and businesses and look at the ways in which the factors of production are combined to produce the goods and services that people need.
50922
Economics is the study of how scarce resources are used to produce outputs—goods and services—for distribution among people.
50923
Previously communist economies, such as those of Eastern Europe, are becoming more mixed as they adopt capitalist characteristics and convert previously government-owned businesses to private ownership
50924
Fiscal policy relies on the government’s powers of ()。
50925
The ups and downs due to the expansion and contraction of the economy constitute the ()。
50926
In marketing, supply and demand interact to create a(n)()price—the price at which buyers are willing to purchase the amount that sellers are willing to sell.
50927
Businesses are more willing to sell a product when the price ()and less willing to sell it when prices ()。
50928
When sellers supply more of the product than buyers are willing to purchase, a ()is created.
50929
Because they operate in a(n)()industry, a fare decrease at American Airlines will likely result in decreases at Continental, United, and other carriers.
50930
Under ()competition, many sellers sell differentiated products that serve similar purposes.
50931
Product differentiation can be achieved by ()。
50932
The free market system was espoused by ()in his book The Wealth of Nations.
50933
When government-owned businesses convert to private ownership, they go through a process called ()。
50934
()not only provide factors of production(or resources)but also consume goods and services.
50935
应变式传感器的测量电路是把应变片的()转换为()的变化,以便方便地显示被测量的大小。
50936
电涡流传感器常采用()电路和()电路作为测量电路。
50937
常见的压电传感器的测量电路有两种:()和()。
50938
电桥测量电路的作用是将电容式传感器参数的变化转换为()。
50939
电感式传感器采用变压器式交流电桥测量电路时,下列说法不正确的是()。
50940
电感式传感器的常用测量电路不包括()。
50941
与自感式传感器配用的测量电路主要有()。
50942
差动变压器的测量电路常采用()
50943
差动螺线管式电感传感器配用的测量电路有()。
50944
电桥电路有()、和()三种接入方式。采用()供电的为交流电桥。
50945
最常用的()电路作为应变式电阻传感器测量电路,用来测量微弱的电阻值的变化,并将电阻值的变化转换为电压或电流的变化。
50946
双臂桥(1/2电桥电路)不管其两个桥臂的应变片连接方向如何,其测量电路的灵敏度都是单臂桥电路的2倍。
50947
单臂桥电路的输出电压存在非线性误差,当应变阻值变化率较低时,其灵敏度近似等于1/4Ui。
50948
应变式电阻传感器的测量电路中,()电路的灵敏度最高。
50949
为了提高霍尔元件的灵敏度,霍尔元件的厚度一般应该做得比较厚。
50950
压电式传感器不适用于静态测量,只适用于动态测量。
50951
对于压电材料,如果存在正压电效应,则同时一定存在逆压电效应。
50952
石英材料的居里点指的是压电效应最大的时候的温度值。
50953
正压电效应实现的是电能到机械能的转换,逆压电效应实现的是机械能到电能的转换。
50954
在热电偶回路中,接入第三种导体,只要该导体两端温度相同,则热电偶产生的总电动势不变。
50955
将超声波转换成电信号是利用压电材料的逆压电效应。
50956
超声波传感器属于接触测量。
50957
对于直线位移式的光栅传感器,莫尔条纹的方向平行于光栅条纹方向。
50958
两种不同导体接点处产生的热电动势数值的大小取决于两种导体的()和()。
50959
热电阻是利用导体的电阻率随温度的变化这一物理现象来测量温度的,几乎所有的物质都具有这一特性,但作为测温用的热电阻应该具有以下特性()。
50960
以下元件中,属于光源的有()。
50961
压电式传感器的输出信号可以是()。
50962
下列属于超声波特点的是()。
50963
数字式传感器的特点包括()。
50964
霍尔传感器基于()。
50965
霍尔传感器一般采用()材料。
50966
霍尔传感器公式中的角是指()。
50967
霍尔元件是()端元件。
50968
判断气体具体浓度大小的传感器是()。
50969
洗手后,将湿手靠近自动干手机,机内的传感器便驱动电热器加热,有热空气从机内喷出,将湿手烘干,手靠近自动干手机能使传感器工作,是因为()。
50970
金属应变片的应变效应是基于()的变化而产生的。
50971
光纤传感器一般由三部分组成,除光纤之外,还必须有光源和()两个重要部件。
50972
下列光电器件是基于光导效应的是()。
50973
下列光电器件是根据外光电效应做出的是()。
50974
光敏电阻在光照下,阻值()。
50975
采用()电容式传感器可测量物体的加速度。
50976
使用()可测量液体中的成分含量。
50977
自感式传感器采用差动结构是为了()。
50978
负温度系数热敏电阻的阻值随着温度的升高而()。
50979
热敏电阻是利用()材料的电阻率随温度的变化而变化的性质制成的。
50980
热电阻能将温度转换为()。
50981
热电偶由()金属材料制作而成,将温度转化为热电动势。
50982
压电式传感器是基于某些材料的()效应。
50983
压电式加速度传感器是适合测量()信号的传感器。
50984
将一束频率为10MHz的超声波(纵波)射入钢板,纵波在钢中的声速为5.9km/s,则此时的波长为()。
50985
超声波单晶直探头传感器的测厚是利用超声波的()特性。
50986
单晶直探头接收超声波时是利用压电晶体的()。
50987
采用50线/mm的计量光栅测量线位移,若指示光栅上的莫尔条纹移动了10条,则被测线位移为()mm
50988
某直线光栅每毫米刻线数为25线,采用四细分技术,则该光栅的分辨率为()。
50989
以下不属于莫尔条纹特性的是()。
50990
由于力的作用而使物体表面产生电荷,这种效应称为(),制成的传感器称为()传感器,一般采用()作为传感器的材料。
50991
压电式传感器是基于某些()材料的()效应。
50992
压电晶体表面所产生的电荷密度与()。
50993
光电效应通常分为()、和()三种类型。
50994
光电式传感器的工作基础是()效应,能将光信号的变化转换为电信号的变化。
50995
自动调光台灯中使用的光敏元件是()。
50996
光敏三极管与光敏二极管相比,灵敏度()。
50997
光敏电阻的工作基础是()效应。
50998
热电偶是由()制成的,主要是利用()的(),产生接触电动势随温度的变化而变化,从而达到测温的目的。
50999
热敏电阻是利用()材料的电阻率随温度的变化而变化的性质制成的。()
51000
()的数值越大,热电偶的输出电动势就越大。
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