结构在规定的时间内,规定的条件下,完成预定功能的能力,称为结构的( )。A.适用性

题型:单项选择题

问题:

结构在规定的时间内,规定的条件下,完成预定功能的能力,称为结构的( )。

A.适用性

B.可靠性

C.安全性

D.耐久性

考点:一级建造师建筑工程建筑工程管理与实务
题型:单项选择题

若以鸡蛋蛋白液为材料进行蛋白质鉴定实验,发现蛋白液与双缩脲试剂发生反应后会粘固在试管壁上。下列关于这一现象形成原因的描述中正确的是[ ]

A.鸡蛋蛋白液稀释不够,搅拌不匀

B.只添加了双缩脲试剂A,未添加双缩脲试剂B

C.鸡蛋蛋白液不是合适的实验材料

D.蛋白液与双缩脲试剂的反应时间不够长

题型:单项选择题

氧化反应系统气气换热器属于()换热。

A、并流

B、逆流

C、错流

D、折流

题型:单项选择题

用随机数法从100名学生(男生25人)中抽选20人进行评教,某男学生被抽到的可能性是(    )。

题型:单项选择题

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.

Bradley hit the front page headline for()

A. he was the first black mayor in history

B. he was the first black mayor in the south of the USA

C. he was the first black mayor of one of the largest cities in the USA

D. a poor farmer’s son could also win an important election

题型:单项选择题

()可以钻孔打眼,固定在工具台上,更加牢固稳定,精度、准确度可以更高。

A、手拉葫芦

B、千斤顶

C、电钻

D、台钻

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