单选题的渐近线的条数为______．

单选题设f(x)在x=0四阶可导，且在x=0某邻域在x=0连续，则必有f(4)(0)=

单选题设且|A|=m，则|B|=A.m．B.-8m．C.2m．D.-2m．

单选题设函数，则函数f(x)有(A)两个第一类间断点．(B)三个第一类间断点．(C)两个第一类间断点与一个第二类间断点．(D)一个第一类间断点与一个第二类间断点．

单选题已知方程ax2+bx+c=0的两个根是-2，3，且函数y=ax2+bx+c的最小值是则a，b，c的值分别为()．(A)-1，1，6(B)-2，2，3(C)1，-1，-6(D)2，-2，-3

单选题已知A，B，C均为圆上的点，问O是否为圆心?(1)AO=OB(2)A0=OC(A)条件(1)充分，但条件(2)不充分．(B)条件(2)充分，但条件(1)不充分．(C)条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．(D)条件(1)充分，条件(2)也充分．(E)条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

单选题在平面直角坐标系中，以直线y=2x+4为轴与原点对称的点的坐标是______·A．B．C．D．E．

单选题 At the present time, 98 percent of the world energy consumption comes from stored sources, such as fossil fuels or nuclear fuel. Only hydroelectric and wood energy represent completely renewable sources on ordinary time scales. Discovery of large additional fossil fuel reserves, solution of the nuclear safety and waste disposal problems, or the development of controlled thermonuclear fusion will provide only a short-term solution to the world's energy crisis. Within about 100 years, the thermal pollution resulting from our increased energy consumption will make solar energy a necessity at any cost. Man's energy consumption is currently about one part in ten thousand that of the energy we receive from the sun. However, it is growing at a 5 percent rate, of which about 2 percent represents a population growth and 3 percent a per capita energy increase. If this growth continues, within 100 years our energy consumption will be about 1 percent of the absorbed solar energy, enough to increase the average temperature of the earth by about one degree centigrade if stored energy continues to be our predominant source. This will be the point at which there will be significant effects in our climate, including the melting of the polar ice caps, a phenomenon which will raise the level of the oceans and flood parts of our major cities. There is positive feedback associated with this process, since the polar ice cap contributes to the partial reflectivity of the energy arriving from the sun: As the ice caps begin to melt, the reflectivity will decrease, thus heating the earth still further. It is often stated that the growth rate will decline or that energy conservation measures will preclude any long-range problem. Instead, this only postpones the problem by a few years. Conservation by a factor of two together with a maintenance of the 5 percent growth rate the problem by only 14 years. Reduction of the growth rate to 4 percent postpones the problem by only 25 years; in addition, the inequities in standards of living throughout the world will provide pressure toward an increase in growth rate, particularly if cheap energy is available. The problem of a changing climate will not be evident until perhaps ten years before it becomes critical due to the nature of an exponential growth rate together with the normal annual weather variations. This may be too short a period to circumvent the problem by converting to other energy sources, so advance planning is a necessity. The only practical means of avoiding the problem of thermal pollution appears to be the use of solar energy. (Schemes to "air-condition" the earth do not appear to be feasible before the twenty-second century. ) Using the solar energy before it is dissipated to heat does not increase the earth's energy balance. The cost of solar energy is extremely favorable now, particularly when compared to the cost of relocating many of our major cities.

单选题关于x的方程x2+mx+3m-9=0的两根之比为2:3，则实数m的值等于______．A．m=5B．C．D．E．m=-5

单选题设f"(x)=1，且f(0)=1，则∫f(x)dx=______A．x+CB．C．x2+x+CD．

单选题级数(常数a＞0)______A.发散B.条件收敛C.绝对收敛D.收敛性与a有关

单选题A four-character password consists of one letter of the alphabet and three different digits between 0 and 9, inclusive. The letter must appear as the second or third character of the password. How many different passwords are possible? (A) 5,040 (B) 18,720 (C) 26,000 (D) 37,440 (E) 52,000

单选题若(x+y):(y+z):(z+x)=4:2:3，则______．