(文)已知关于x的方程x2+mx+n+1=0的两根为x1,x2,且满足-1<x1

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问题:

(文)已知关于x的方程x2+mx+n+1=0的两根为x1,x2,且满足-1<x1<0<x2<1,则点(m,n)所表示的平面区域面积为(  )
A.
1
2
B.
3
4
C.1D.2
考点:简单线性规划问题(用平面区域表示二元一次不等式组)一元一次方程及其应用
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On a weekday night this January, thousands of flag-waving youths packed Olaya Street, Riyadh’s main shopping strip, to cheer a memorable Saudi victory in the GCC Cup football final. One car, rock music blaring from its stereo, squealed to a stop, blocking an intersection. The passengers leapt out, clambered on to the roof and danced wildly in front of the honking crowd. Having paralyzed the traffic across half the city, they sped off before the police could catch them.
Such public occasion was once unthinkable in the rigid conformist kingdom, but now young people there and in other Gulf states are increasingly willing to challenge authority. That does not make them rebels: respect for elders, for religious duty and for maintaining family bonds remain pre-eminent values, and premarital sex is generally out of the question. Yet demography is beginning to put pressure on ultra-conservative norms.
After all, 60% of the Gulf’s native population is under the age of 25. With many more of its citizens in school than in the workforce, the region faces at least a generation of rocketing demand for employment. In every single GCC country the native workforce will double by 2020. In Saudi Arabia it will grow from 3.3m now to over 8m. The task of managing this surge would be daunting enough for any society, but is particularly forbidding in this region, for several reasons.
The first is that the Gulf suffers from a lopsided labor structure. This goes back to the 1970s, when ballooning oil incomes allowed governments to import millions of foreign workers and to dispense cozy jobs to the locals. The result is a two-tier workforce, with outsiders working mostly in the private sector and natives monopolizing the state bureaucracy. Private firms are as productive as any. But within the government, claims one study, workers are worth only a quarter of what they get paid.
Similarly, in the education sector, 30 years spent keeping pace with soaring student numbers has taken a heavy toll on standards. The Saudi school system, for instance, today has to cope with 5m students, eight times more than in 1970. And many Gulf countries adapted their curricula from Egyptian models that are now thoroughly discredited. They continue to favor rote learning of "facts" intended to instill patriotism or religious values.
Even worse, the system as a whole discourages intellectual curiosity. It channels students into acquiring prestige degrees rather than gaining marketable skills. Of the 120, 000 graduates that Saudi universities produced between 1995 and 1999, only 10,000 had studied technical subjects such as architecture or engineering. They accounted for only 2% of the total number of Saudis entering the job market.

According to the author, the Saudi education system is characterized by its excessive emphasis on

A.technical creativity.

B.intellectual cognition.

C.conservative values.

D.nonconformist images.

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今天是星期一,明天(    )是星期二。(填“一定”、“不可能”、“可能”)

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为了减少因火电站中煤的燃烧对大气的污染而大力发展水电站。三峡水利工程

中某一水电站发电机组设计为:水以v1=3m/s的速度流入水轮机后以v2=1m/s的速度

流出,流出水位比流入的水位低10m,水流量为Q=10m3/s,水轮机效率为75﹪,发

电机效率为80﹪,求:

(1)发电机组的输出电功率是多少?

(2)如果发电机输出电压为240V,用户需电压220V,输电线路中能量损失为5﹪,

输电线电阻为19.5Ω,那么所需升降变压器的原副线圈匝数比分别是多少?

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应收账款转让筹资的成本较低,但限制条件较多。( )

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( )是负责煤矿安全监察工作的行政执法机构,依法对煤矿履行国家监察职责。

A.公安部
B.国家安全生产监督管理总局
C.卫生部
D.煤矿安全监察机关

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