i5T3.3机床使用的伺服刀架的伺服电机采用何种形式的编码器结构？

反映标准化心理测验可靠性的技术指标是（）

A.样本量

B.常模

C.标准差

D.信度

E.效度

简述社区文化的特征及其功能

Due to a constantly (66) environment, a poor understanding of the user’s needs and preferences, as well as a (67) of willingness to modify (68) 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 (69) meta model, the Extended World Wide Web Design Technique (eW3DT), provide hypertext designers (70) a conceptual, user-centric framework and graphical notation for the construction of both, (71) and customized models, during the software development (72) of commercial WIS. A reference model as a normative concept represents an abstraction of a (73) company, its functional units, or its (Web) Information System and is intended to streamline the design and implementation of complex applications at (74) costs. As precondition for pursuing a partial globalization strategy, eW3DT (75) between technical and content-specific responsibilities for designing, implementing, and maintaining WIS.

A．of

B．in

C．to

D．with

欲用200万元购买某专利，专利的有效期为8年，所需的资金可以按年利率10%从银行贷款，8年内均等地偿还本利和。为了使购买的专利不造成损失，每年年末的净收益应超过( )万元。
已知：(A/P，10%，8)=0.18744。

A．39.486
B．37.488
C．36.885
D．37.665

汽、煤油仍能与水混合，可溶有0.01%以上的水。