试题与答案

MRPⅡ的两个假设是什么?

题型:问答题 简答题

题目:

MRPⅡ的两个假设是什么?

答案:

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参考答案:(1)传递空间交错轴之间的运动和动力,即空间机构。(2)蜗轮蜗杆啮合时,在理论上齿廓接触是点接触,但是蜗轮是用与蜗轮相啮合的蜗杆的滚刀加出来的,实际为空间曲线接触。(3)蜗杆蜗轮的传动比,用...

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题型:阅读理解

A couple of years ago, those who forecast that oil price would reach $ 100 a barrel were seen as doomsters. However, now some are predicting $ 200 a barrel.

Had economists been told that oil price would barely pause at $ 100 before reaching the recent peak of nearly $ 127, they would no doubt have forecast terrible economic consequences. But the global economy, though interrupted by the high price of energy, is still chugging along. Meanwhile, inflation has picked up, but the headline rates of inflation (通货膨胀率) in most developed countries are nowhere near the levels seen in the 1970s and 1980s.

There are three explanations for the oil price’s unclear impact. The first is that nowadays developed economies are more efficient in their use of energy, thanks partly to the increased importance of service industries and the diminished role of manufacturing(制造业). According to the Energy Information Administration, the energy intensity of America’s GDP fell by 42% between 1980 and 2007.

A second theory is that the oil-price rise has been steady, not sudden, giving the economy time to adjust. Giovanni Serio of Goldman Sachs points out that in 1973 there was a severe supply shock because of the oil embargo(石油禁运), when the world had to cope with 10%-15% less crude almost overnight. Not this time.

The third explanation turns the argument on its head; rather than oil harming the global economy, it is global expansion that is driving up the price of oil.

The most important factor is the shift in favor of the developing economies. America has responded to high price in familiar fashion: UBS forecasts that demand will drop by 1.1% this year and will be no higher in 2010 than it was in 2004. But the demand from China and other emerging markets is more than offsetting(抵消) this shortfall.

小题1:What is the passage mainly talking about?

A.The prediction of economists.

B.The situation of economy

C.The increase of oil price

D.The American response to high price小题2:How many explanations for the oil price’s impact are mentioned in the passage?

A.Two

B.Three

C.Four

D.Five小题3:What can we conclude from the passage?

A.In USA, the demand for oil in 2010 will be very high.

B.In USA, the demand for oil in 2010 will be higher than it was in 2004.

C.In USA, the demand for oil in 2010 will be as high as it was in 2004.

D.In USA, the demand for oil in 2010 will be as low as it was in 2004.

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题型:单项选择题

(一)某汽车货运公司上半年(1至6月共l81天)拥有5吨载货汽车150辆及5吨挂车50辆,营运车日为22650车日,工作车日为18120车日,总行程为6958080公里,其中载重行程4174848公里,汽车完成货物周转量为l7847475吨公里,另完成搭乘押运人员旅客周转量l9830530人公里,挂车完成货物周转量13220352吨公里。受金融危机影响,企业车辆生产效率低于去年。

该公司上半年车辆实载率为( )。

A.55%

B.56%

C.57%

D.58%

E.60%

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