如图所示，物重G为2000N，斜面长5m，高3m，斜面和滑轮组装置的总机械效率为

发布时间：2017-07-26 07:09 │ 来源：www.tikuol.com

题型：计算题

问题：

如图所示，物重G为2000N，斜面长5m，高3m，斜面和滑轮组装置的总机械效率为80%，若将重物沿斜面以0.2m/s的速度拉上来，求：

（1）所需拉力F是多少？

（2）机械的总功率是多少？

考点：滑轮（组）中拉力的计算功率的计算

题型：计算题

以下说法中不符合客户风险偏好类型与资产增值能力的关系的是（）。

A.保守型的客户其资产增值的可能性很小

B.轻度保守型客户其资产有较大的增值潜力，但资产价值波动较大

C.中立型客户其资产有一定的增值潜力，资产价值亦有一定的波动

D.进取型客户其资产增值潜力很大，资产价值的波动很大

查看答案

题型：计算题

D

Awardwinning author Emma Donoghue's latest book, Room, is a unique and amazing story about a boy's experience living in a small，windowless room with his mother. The 11' x 11' space between the walls of the room is actually all the boy knows because he was born there and has never left. Room will horrify ，surprise, sadden, and finally delight you. Attracted from the start, readers of all sorts won't want to put Room down. ◆First published in the U. S. in September 2010 ◆Publisher: Little Brown ◆321 Pages
Literary master Ian McEwan returns with Solar, a novel about a Nobel prizewinning physicist. The physicist's personal life is in a mess as his fifth marriage breaks，but this time he actually loves his wife and wants to make things better. Solar is a funny story, completely unusual and as good as anything the writer has ever written. ◆Published in March 2010 ◆Publisher: Knopf Doubleday ◆304 Pages
One Day by David Nicholls was an international bestseller before it was released in the U. S. in June. Although it is well written and funny at times, don't be fooled—this isn't a goodfeeling romantic comedy. If you decide to read it, be prepared for some heavy moments. ◆Published in the U．S. in June 2010 ◆Publisher: Vintage Contemporaries ◆437 Pages
Fall of Giants by Ken Follett is the first book in a new trilogy (three books)that will take readers through the major events of the twentieth century by following five families. In Fall of Giants, most of the action centers on World War I and the Bolshevik Revolution. Although Fall of Giants is more than 1,000 pages and has many characters，the story is remarkably connected. ◆Published in September 2010 ◆Publisher: Dutton ◆1,008 Pages

小题1:Which of the following is NOT true according to the text?

A．Ian McEwan once won the Nobel Prize.

B．Fall of Giants is mostly set in wars.

C．One day is written by David Nicholls.

D．Solar is a funny story about a physicist.

小题2:We can know from the text that ________.

A．the main character of Room has a wide range of knowledge

B．Solar is the only book that Ian McEwan has ever written

C．all the four books were not published in the same month

D．One Day is a funny romantic comedy that sells very well

小题3:We can infer from the passage that ________.

A．the sixth of Ian McEwan's marriages broke

B．Room by Emma Donoghue has a happy ending

C．the publisher of One Day is Little Brown

D．Dutton and Ken Follett are both publishers

查看答案

题型：计算题

国务院《特种设备安全监察条例》第六十三条规定：（）为较大事故。

A.客运索道、大型游乐设施高空滞留100人以上并且时间在48小时以上的

B.压力容器、压力管道有毒介质泄漏，造成5万人以上15万人以下转移的

C.锅炉、压力容器、压力管道爆炸的

D.起重机械主要受力结构件折断或者起升机构坠落的

查看答案

题型：计算题

社会组织的独特特征。

查看答案

题型：计算题

设随机变量X与Y的相关系数ρ_XY=ρ，而Z=aX+6(a，b为常数)，则使ρ_YZ=ρ的充分必要条件是（）。

查看答案

更多题库