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问题 选择题

甲乙丙三个物体具有相同的动能，甲的质量最大，丙的质量最小，要使它们在相同的距离内停止，若作用在物体上的合力为恒力，则合力（　　）

A．甲的最大

B．丙的最大

C．都一样大

D．取决于它们的速度

答案

根据动能定理得：-F合s=0-Ek

则得F合=

Ek
s

由题知，s、Ek相同，则得合力大小相等，故C正确，ABD错误．

故选C

判断题

进口需要检疫审批的货物，必须在检疫许可证规定的口岸入境。（）
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单项选择题

Service ______ Architecture aims to provide a model for the creation of service components in a widerange of languages and a model for assembling service components into a business solution - activities which areat the heart of building applications using a ______ architecture.
Service Data Objects aims to provide consistent means of handling ______ within applications,whatever its source or ______ may be. SDO provides a way of unifying data handling for databases and forservices. SDO also has mechanisms for the handling of data while ______ from its source.

A. consisted B. builded C. assembled D. detached
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