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【单选题】
The traditional distinction between products that satisfy needs and those that satisfy wants is no longer adequate to describe classes of products. In today's prosperous societies the distinction has become blurred because so many wants have been turned into needs. A writer, for instance, can work with paper and pencils. These are legitimate needs for the task. But the work can be done more quickly and efficiently with a word processor. Thus a computer is soon viewed as a need rather than a want. In the field of marketing, consumer goods are classed according to the way in which they are purchased. The two main categories are convenience goods and shopping goods. Two lesser types are specialty goods and unsought goods. It must be emphasized that all of these types are based on the way shoppers think about products, not on the nature of the products themselves. What is regarded as a convenience item in France(wine, for example) may be a specialty goods in the United States. People do not spend a great deal of time shopping for such convenience items as groceries, newspapers, toothpaste, razor blades, aspirin, and candy. The buying of convenience goods may be done routinely, as some families buy groceries once a week. Such regularly purchased items are called staples. Sometimes convenience products are bought on impulse: someone has a sudden desire for an ice cream on a hot day. Or they may be purchased as emergency items. Shopping goods are items for which customers search. They compare prices, quality, and styles, and may visit a number of stores be fore making a decision. Buying an automobile is often done this way. Shopping goods fall into two classes: those that are perceived as basically the same and those that are regarded as different. Items that are looked upon as basically the same, include such things as home appliances, television sets, and automobiles. Having decided on the model desired, the customer, is primarily interested in getting the item at the most favorable price. Items regarded as inherently different include clothing, furniture, and dishes. Quality, style, and fashion will either take precedence over price, or they will not matter at all. Specialty goods have characteristics that impel customers to make special efforts to find them. Price may be no consideration at all. Specialty goods can include almost any kind of product. Normally, specialty goods have a brand name or other distinguishing characteristics. Unsought goods are items a consumer does not necessarily want or need or may not even know about. Promotion or advertising brings such goods to the consumer's attention. The product could be something new on the market as the Sony Walkman once was or it may be a fairly standard service, such as life insurance, for which most people will usually not bother shopping. A word processor can be looked on as satisfying a need rather than a want if ______.
A.
it is used at home to do paper work
B.
it is used by a writer to type a novel
C.
it becomes the only means to an end
D.
a writer does not want to use it
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【多选题】 关于参考系、坐标系说法正确的有
A.
参考系选定后,坐标系可以有不同的选择
B.
参考系是观测描述运动的标准物体是实体;坐标系仅仅是数学工具
C.
坐标系就是参考系
D.
极坐标系是非惯性系
【判断题】社区法律援助的特殊人群不包括优抚对象。
A.
正确
B.
错误
【单选题】对于参考系与坐标系,下列说法正确的是( )。
A.
参考系就是坐标系
B.
参考系是为了定量地描述物体的运动情况而引入的
C.
坐标系是为了定性地描述物体的运动状态而引入的
D.
坐标系是参考系的数学抽象
【多选题】多项选择题11:下面有关三极管基本概念阐述正确的是:
A.
晶体三极管具有电流放大作用,其实质是三极管能以基极电流微小的变化量来控制集电极电流较大的变化量,这是三极管最基本的和最重要的特性。
B.
我们将ΔIc/ΔIb的比值称为晶体三极管的电流放大倍数,用符号“β”表示。
C.
电流放大倍数对于某一只三极管来说是一个定值,但随着三极管工作时基极电流的变化也会有一定的改变。
D.
三极管可以分为功率型、中功率型、大功率等几种。
【判断题】工作坐标系是用户建立模型时的参考坐标系。系统缺省的坐标系就叫做工作坐标系,而用户定义的坐标系叫做绝对坐标系。
A.
正确
B.
错误
【多选题】关于参考系、坐标系说法正确的有
A.
坐标系就是参考系
B.
坐标系的选择不是任意的
C.
参考系选定后描述物理的运动才是确定的
D.
参考系选定后,坐标系可以有不同的选择
【单选题】描述社区公共营养师角色不正确的是( )。
A.
照顾者角色向社区居民提供包括生活方面及特殊情况下的各种营养照顾服务
B.
教导者角色向包括个人、人群和单位等社区居民提供各种营养方面的健康教育和健康指导服务
C.
研究者角色要注意观察、探讨、研究与营养相关的问题,不断完善社区营养的发展及社区服务
D.
管理者角色根据社区的具体情况及政府的需求设计、组织各种促进和维护社区居民营养健康的活动
【单选题】某型号收音机晶体三极管的寿命的密度函数为 (单位: ),装有5个这种三极管的收音机在使用的前1500 内需要更换三极管的个数服从( )。
A.
点分布
B.
二项分布
C.
泊松分布
D.
正态分布
【判断题】正轴坐标系就是以材料主方向为参考而建立的坐标系,对于单向板而言,就是沿纤维方向建立的坐标系。
A.
正确
B.
错误
【单选题】由于某种型号三极管的参数变化使放大电路的电压增益改变20%,现希望引入负反馈后的增益为-100,而其变化只有1%。开环增益和反馈系数分别为()。
A.
2000 ,0.0095
B.
- 2000 ,0.009 5
C.
2000 , - 0.0095
D.
- 2000 , - 0.0095
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