自相关函数和互相关函数图形都是对纵坐标对称的图。

题型:判断题

问题:

自相关函数和互相关函数图形都是对纵坐标对称的图。

考点:电子与通信技术信号检测信号检测题库
题型:判断题

女,58岁,近来感到头痛、头昏、乏力、心悸,来院就诊,行胸部X线平片检查如下图,应考虑下列哪种疾病()

A.二尖瓣狭窄

B.二尖瓣关闭不全

C.高血压性心脏病

D.动脉导管未闭

E.房间隔缺损

题型:判断题
3升+200毫升=(  )毫升。
A.2003B.320C.3200
题型:判断题

In 1955, a man named Raymond Kroc entered a partnership with two brothers named McDonald. They opened a popular restaurant in California which sold food that was easy to prepare and serve quickly. Hamburgers, French fries, and cold drinks were the main food there. Kroc opened similar eating places under the same name, “McDonald’s”, and they were an instant success. He later took over the company, and today it is one of the most famous and successful “fast-food” in America and round the world.  

Why was his idea successful? Probably the most important reason was that his timing was right. In the 1950s, most married women stayed home to keep house and take care of their children. In the 1960s, many women returned to the workplace. This meant that they had less time or energy to prepare meals, so they spent more on “ TV dinners ” and fast-food restaurants. Single parents also have little time to spend in the kitchen. People living alone also depend on this type of food, since cooking for one is often more trouble than it is worth.

Fast-food is not part of the diet of all Americans. Another trend of the 1960s, sometimes called the back-to-nature movement influenced many people to avoid food that was packaged or processed(处理). This preference for natural food continued to this day.

From the success of Raymond Kroc’s fast-food business, we can say that social economic trends influence where and what we eat.

小题1:The underlined sentence “Cooking for one is often more trouble than it is worth” means that ______.

A.cooking for some people is worth more money

B.it is not worthwhile to take too much time to cook for one person

C.there are more problems when one person cooks

D.divorce (离婚) causes people to change their eating habits小题2:An idea implied but not directly stated in the reading is that ________.

A.many married women began to work in the 1960s

B.natural foods are still popular today

C.fast food is not part of the diet of all Americans

D.divorce causes people to change their eating habits小题3:McDonald’s success lies in the following causes BUT_________.

A.people living alone tend to depend on fast food

B.single parents have little time to spend in the kitchen

C.many women returned to the workplace in the 1960s

D.Kroc chose the “Mc Donald” brothers as his partners小题4:The main idea of the reading is that ________.

A.Raymond Kroc is the most successful fast-food business owner in the world

B.social and economic changes affect eating habits

C.fast-food is easy to prepare and serve quickly

D.Americans eat either fast food or natural food

题型:判断题

根据现行会计制度规定,对于销货业务,销货单位即使在向客户提供现金折扣的情况下,也应按总价法确认应收账款的入账价值。 ( )

题型:判断题

下图表示某地云杉林的形成过程。下列相关叙述,正确的是()

A.该群落的演替属于初生演替,群落结构越来越复杂

B.在人为干扰下,可能发生⑤→①的动态变化,但不属于群落演替

C.该群落演替是群落内部因素和外界环境因素综合作用的结果

D.在⑤云杉林群落中有明显的垂直结构,没有水平结构

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