【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( )
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
【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...
【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( )
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
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)