下列关于寿险公司资产组合管理的目标和限制因素的描述中，不正确的是（ ）。
A．寿险公司的风险容忍程度很低，资产组合有安全性和流动性要求
B．新的寿险产品的诞生（如投资连结型保险）对资产组合管理提出了更高要求
C．寿险资金一般有明显的期限特征，资产组合管理将受到投资期限的限制
D．在构建组合时，各种投资工具的税赋不应当作为参考因素
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一辆重5t的汽车，发动机的额定功率为80kW．汽车从静止开始以加速度a=1m/s2做匀加速直线运动，车受的阻力为车重的0.06倍，g=10m/s2，求：
（1）汽车做匀加速直线运动的最长时间tm．
（2）汽车开始运动后5s末和15s末的瞬时功率．
On May 29, 1973, Thomas Bradley, a black man, was elected mayor of Los Angeles. Los Angeles is the third largest city in the United States, with a population of three million. About sixteen percent of the city’s population are black.
News of this election appeared on the front pages of newspapers everywhere in the United States. Here is how one major newspaper reported the event.
LOS ANGELES ELECTS BRADLEY MAYOR UNSEATING YORTYBLACK WINS 56% OF VOTES
Bradley called his victory over Yorty "the fulfillment of a dream". During his childhood and youth, people had kept telling him, "You can’t do this, you can’t go there, because you are a Negro. " Nevertheless he had won a decisive victory over a man who had been won 43.7 percent.
Los Angeles voters have had many opportunities to judge. Thomas Bradley had to form an opinion of him. The son of a poor farmer Texas, he joined the Los Angeles police force in 1940. During his twenty-one years on the police force he earned a law degree by attending school at night. He was elected to the city council ten years ago.
At the time of the Los Angeles election, three other American cities already had black mayors, but none of those cities had as large a population as Los Angeles. Besides, the percentage of blacks in those other cities was much larger. Cleveland, Ohio, had thirty-six percent black when Carl Stokes was elected mayor of Cleveland in 1967. In the same year Richard Hatcher was elected mayor of Cary. In Newark, New Jersey, sixty percent of the population were black when Kenneth Gibson was elected in 1970. Thus election of a black mayor in those cities was not very surprising.
In Los Angeles thousands of white citizens voted for Thomas Bradley because they believed he would be a better mayor than the white candidate. Bradley had spent forty-eight of his fifty-five years in Los Angeles. Four years ago Bradley lost mayoral election to Yorty. This time Bradley won.
In the author’s opinion, it was surprising that（）
A. the whites would vote for a black mayor
B. a black mayor would be elected in such a large city
C. a black from a poor farmer’s family could be elected mayor of Los Angeles
D. there would be so many black mayors
二项分布的应用条件是（）
A.各观察单位的观察结果是相互独立的
B.各观察单位的观察结果是不独立的
C.各观察单位的观察结果是单一的
D.各观察单位的观察结果是多种情况的
E.某一观察结果的概率为非常数的
水泥混凝土路面板钻芯后，应采用（）进行修补。
A.水泥砂浆
B.同级配水泥混凝土
C.冷补沥青混合料
D.乳化沥青碎石
申请工程咨询企业名称预先登记不需提交的文件和证件有( )。
A．组建单位的财务报表
B．企业名称预先登记申请书
C．自然人身份证明
D．指定(委托)书