已知函数F(x)=-2x12+2x1x2-x22+2x1，判断其驻点（1,1）是（）-湖北继续教育网网校

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[单选题]已知函数F(x)=-2x12+2x1x2-x22+2x1，判断其驻点（1,1）是（）

A极大值点

B极小值点

C非极值点

D无法判断

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1. 1.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)1.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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3. Passage 2 The past thirty years have seen a dramatic transformation in Thailand's industrial structure. From a primary product producer exporter, Thailhas evolved into a major regional manufacturing force. Agriculture now accounts for less than 13 percent of economic activity while manufacturing contributes more than 26 percent. Structural transformation is most evident in the export sector. Manufactured exports have more than doubled from around 30 percent of total exports in 1980 to over 70 percent in 1990. Textiles have supplanted rice as Thailand's major export item the nation is now a major exporter of more sophisticated products such as hard disk drivers for computers, precision micro ball bearings, integrated circuits. The structural shifts of the Thai economy have been fueled in part by the extremely rapid growth of the economy in recent years. Following a steady 5.5 percent growth in real gross domestic product (GDP)from 1980 to 1986, the economy accelerated into double digit growth in 1988 with GDP increasing by 13.2 percent—the highest in East Asia. This was repeated in 1989 1990 with growth of 12.2 percent 10 percent respectively. The economy is expected to grow by 8-9 percent per annum in the 1990s. A key factor in Thailand's economic success in recent years has been the stable macroeconomic environment which has greatly facilitated private sector decision making. Macroeconomic imbalances which plague many industrializing countries have been contained in Thailand. Prudent monetary policy has led to stable prices although, as the economy entered its rapid growth phase in the late 1980s, inflation crept up to relatively high but still manageable levels of 5.4 percent in 1989 6.0 percent in 1990. Inflation is expected to reach about 6.0 percent again in 1991. Inflows of foreign capital technology transfer have also contributed significantly to the structural transformatin. From the end of 1986, Thailbecame a favorite location for foreign firms escaping from appreciating currencies escalating labor costs at home. Statements: 47.Rice is still Thailand's major export item now.( ) 48.Sophisticated goods are goods that are consumed by clever people.( ) 49.There have been large inflows of foreign capital technology transfer to Thailsince 1986, because foreign firms want to escape from appreciating currencies increasing labor costs at home.( ) 50.The stable macroeconomic environment has been one of the chief factors in Thailand's economic success in recent years. 51.Thailand's inflation rate in recent years has stayed at manageable level, which attributes to government monetary stimulus.
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