已知代数式x2-2x-1的值等于4,则代数式3x2-6x-2的值( ) A.11

题型:选择题

问题:

已知代数式x2-2x-1的值等于4,则代数式3x2-6x-2的值(  )

A.11

B.12

C.13

D.15

考点:代数式的求值
题型:选择题

直流电动机不能起动的原因是()。

A、电源没有电压或未接通

B、电刷太硬

C、电动机过载

D、电源电压低于额定电压1%

题型:选择题

护理诊断公式中的P代表

A.病人的健康问题
B.病人的现状
C.症状与体征
D.病人的既往史
E.病人健康问题发生的原因

题型:选择题

建设项目招投标是政府及公共领域广泛推行的一种( )。

A.承包方式
B.采购制度
C.竞争模式
D.合同手段

题型:选择题

Due to a constantly (71) environment, a poor understanding of the user’s needs and preferences, as well as a (72) of willingness to modify (73) organizational structures and decision models, the full economic potential of Web.
Information Systems (WIS) has not been realized by now. The data object types of the (74) meta model, the Extended World Wide Web Design Technique (EW3DT), provide hypertext designers (75) a conceptual, user-centric framework and graphical notation for the construction of both, reference and customized models, during the software development process of commercial WIS. A reference model as a normative concept represents an abstraction of a typical company, its functional units, or its (Web) Information Systems and is intended to streamline the design and implementation of complex applications at reduced costs. As precondition for pursuing a partial globalization strategy, EW3DT distinguishes between technical and content-specific responsibilities for designing, implementing, and maintaining WIS.

A.lack

B.since

C.big

D.lot

题型:选择题

2024铝合金是一种什么铝合金()?

A、AL-Mg合金

B、AL-Zn合金

C、AL-Cu合金

D、AL-Si合金

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