试题与答案

水平传送带以速度v匀速运动,一质量为m的小木块,由静止轻放到传送带上,若小木块与

题型:问答题

题目:

水平传送带以速度v匀速运动,一质量为m的小木块,由静止轻放到传送带上,若小木块与传送带间的动摩擦因数为μ,如图所示,当小木块与传送带相对静止时,转化为内能的能量为____________.

答案:

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化学;电

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题型:填空题

今年我国西南地区遇到了百年罕见的干旱,给当地居民带来极大的生活困难,造成巨大的经济损失.警钟已经敲响,合理开发和利用水资源刻不容缓,节约用水、爱护水是每个公民应尽的责任和义务.

(1)采用______操作可以除去污水中的碎菜叶、碎塑料薄膜、泥沙等.

(2)①硬水给生活和生产带来很多麻烦,欲判断得到的生活用水是硬水还是软水,可用______来区分硬水和软水.

②生活中常通过______的方法来降低水的硬度.

(3)当你身处在地震灾区时,水资源受到严重污染,必须经过净化处理后才能饮用.下列各项与水的净化过程无关的是______(填标号).

A.吸附            B.消毒            C.电解         D.过滤.

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题型:单项选择题

The linkages between project management process groups are best described by:

A.The work breakdown structure links process group

B.Process groups are linked by their planned objectives-the summary objective of one often becomes the detailed action plan for anothe

C.Process groups are linked by the objectives they produce-the output of one process often becomes an input to another process, or is a deliverable of the projec

D.There are no significant links between discrete process group

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