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问题 多项选择题

股票是股份有限公司发行的用以证明投资者的股东身份和权益的凭证，股票应载明的事项主要有（）。

A.公司名称

B.公司成立的日期

C.股票种类

D.票面金额

E.股东购买数量

答案

参考答案：A, B, C, D

单项选择题

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.

（67）（）

A.lack

B.since

C.big

D.lot
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问答题

如图所示，竖直固定放置的粗糙斜面AB的下端与光滑的圆弧BCD的B点相切，圆弧轨道的半径为R，圆心O与A、D在同一水平面上，∠COB=θ，现有质量为m的小物体从距D点为

Rcosθ
4
的地方无初速的释放，已知物体恰能从D点进入圆轨道．求：

（1）为使小物体不会从A点冲出斜面，小物体与斜面间的动摩擦因数至少为多少？

（2）若小物体与斜面间的动摩擦因数μ=

sinθ
2cosθ
，则小物体在斜面上通过的总路程大小？

（3）小物体通过圆弧轨道最低点C时，对C的最大压力和最小压力各是多少？
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