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【多选题】
流数据具有以下哪些特征?
A.
数据快速持续到达
B.
数据来源众多
C.
数据量大,但是不十分关注存储。
D.
注重数据的整体价值,不过分关注个别数据。
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参考答案:
举一反三
【简答题】解方程 (1)(x-1) 2 =4 (2)x 2 -2x-2=0 (3)x 3 -2x 2 -3x=0 (4)x 2 -4x+1=0(用配方法)
【单选题】有机物分子中基团间的相互影响会导致化学性质的不同。下列叙述不能说明上述观点的是(  )
A.
乙烯可发生加成反应,而乙烷不能
B.
甲苯可以是高锰酸钾溶液退色,而乙烷不能
C.
甲苯与硝酸作用可得到2,4,6-三硝基甲苯,而苯与硝酸作用得到硝基苯
D.
苯酚能与NaOH溶液反应,而乙醇不能
【简答题】(1)The career planning process is comprised by / of four steps. (2)During this first step you will use a variety to / of tools. (3)You will decide which occupation is the best fit with / for you. (4)Y...
【简答题】选择适当的介词(全部用小写,拼写错误不给分) (1)The career planning process is comprised by / of four steps. (2)During this first step you will use a variety to / of tools. (3)You will decide which occupation is the best f...
【单选题】_____ deals with the planning for, development, management, and use of information technology tools to help people perform all tasks related to information processing and management.
A.
Management by objectives
B.
Management information system
C.
Transaction processing system
D.
Executive information system
【单选题】●Quality planning tools are often used to help plan effective quality management activities.(71) is one of such tools, which involves comparing actual or planned project practices to those of other pr...
A.
Benchmarking
B.
Quality metric
C.
Quality checklist
D.
Brainstorming
【简答题】(1)x 2 +4x+2=0 (2)x 2 -2x-3=0 (3)(x-3) 2 +2x(x-3)=0 (4)2x 2 +1=3x.
【简答题】用隐枚举法求解下列0-1规划问题: (1)min x 0 =2x 1 +5x 2 +3x 3 +4x 4 , s.t.-4x 1 +x 2 +x 3 +x 4 ≥0, -2x 1 +4x 2 +2x 3 +4x 4 ≥4, x 1 +x 2 -x 3 +x 4 ≥1, x j =0或1 (j=1,2,3,4); (2)max  z=2x 1 -x 2 +5x 3 -3x 4 +4x 5 , s.t...
【单选题】分子式为C 9 H 12 的物质含有一个苯环且苯环上只有一个取代基,下列说话正确的是(  )
A.
该有机物不能发生加成反应,但能发生取代反应
B.
该有机物不能是酸性高锰酸钾溶液退色,但能使溴水退色
C.
该有机物分子中所有原子可能在同一平面上
D.
该有机物属于苯的同系物,该类物质的通式为C n H 2n-6 (n≥6)
【单选题】方程 x 2 -4 x =0的解是
A.
x =4
B.
x 1 =1, x 2 =4
C.
x 1 =0, x 2 =4
D.
x 1 =1, x 2 =-4
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