【简答题】China's youths topped a list of calculating abilities , but ranked last on _____ imagination and 5th from _____ bottom for creativity, according to an education survey of 21 countries and regions. [...
【单选题】已知集合A={x|4≤ ≤16},B=[a,b],若A?B,则实数a-b的取值范围是( )
【简答题】已知集合A=[1,4),B=(-∞,a). (1)当a=4时,求A∩B; (2)若A?B,求实数a的取值范围.
【简答题】已知集合A=[1,4),B=(-∞,2a-1),若A?B,则a的取值范围是______.
【单选题】Which of the following Is NoT pint of the last paragraph?
A.
To describe how fantastic the dance is.
B.
To express his gratefulness to god.
C.
To show his deep feeling after seeing the dance。
D.
To share with readers his understanding of the dance.
【单选题】已知集合A={x|lgx≤0},B={x|2 x ≤4},则A∩B=( )
【简答题】What are the permissible data structures for the data staging area? Briefly describe the pros and cons of each. 在数据准备区中允许使用的数据结构有哪些?各有什么优缺点?
【单选题】一般来讲,幼儿园教学活动过程经历了提出问题——讨论问题——探索研究——表现和表达——评价的过程,关于幼儿园教学活动的认识不正确的是 。
B.
活动过程的开始部分,不论使用哪种方法,都应注意调动幼儿已有的经验
C.
教学活动过程只能以提出总是作为过程的起始部分
D.
设计活动过程时,可以只按活动进行的先后顺序逐条写
【单选题】已知集合A={x|log 2 x≤2},B=(-∞,a),若A?B,则实数a的取值范围是( )
【单选题】已知集合A=(-∞,2),B=(-∞,4],则A∪B=( ).