A=(x,y)|x=2cosα,y=2sinα+m,α为参数},B={(x,y)

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问题:

A=(x,y)|x=
2
cosα,y=
2
sinα+m,α为参数},B={(x,y)|x=t+3,y=3-t,t为参数},且A∩B≠∅,求实数m的取值范围.
考点:集合间的基本关系集合间交、并、补的运算(用Venn图表示)圆的参数方程
题型:解答题

事故发生的根本原因以及管理系统向前发展的根本原因( )。

A.反馈性

B.封闭性

C.整分合一体性

D.动态相关性

题型:解答题

A study of a university in Shanghai had found that many of the students there are using a quote(引语)from the Italian poet Dante as a kind of motto.The study of Fudan University, one of China’s top universities, of 489 students, found that 82 had chosen Dante’s “Follow your own path and don’t worry about what others say” as their motto, out of 278 people who said they had a motto.This was followed by “Believe yourself” and “Self-improvement without stop.”

Students also expressed a common hope for greater understanding and care and said they were always ready to give a hand to those in need.

Some researchers think that mottoes can play an important part in children’s growth and they say that a good motto can help children develop a better character.

小题1:The study shows _________.

A.which university should have mottoes

B.what poems are popular

C.how many students like the motto “Believe yourself.”

D.the majority of the students like to choose their favorite mottoes小题2:Of the students asked, _______ students have mottoes.

A.about 78%

B.about 57%

C.about 16%

D.about 8%小题3:The motto “Self-improvement without stop” shares the similar meaning with ______.

A.going on to improve rapidly

B.growing by oneself continuously

C.making oneself better and perfect continuously

D.becoming better without having a break小题4:The best title for the passage should be _______.

A.Mottoes and Character Developing

B.Students and Poet

C.Mottoes and Learning

D.Understanding Care

题型:解答题

政治环境对企业的市场营销有直接影响()

题型:解答题

投资组合分析方法中的通用矩阵的实质是( )。

A.把企业外部环境与企业内部实力归纳在一个矩阵内
B.将市场份额与市场增长率归纳在一个矩阵内
C.将市场供给与市场需求归纳在一个矩阵内
D.将产业结构与市场结构归纳在一个矩阵内

题型:解答题

慢性阻塞性肺疾病康复治疗的禁忌证包括()

A.合并严重肺高压

B.病情稳定的COPD患者

C.合并不稳定心绞痛

D.合并近期肋骨骨折

E.合并严重的肝功能异常

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