在一定置信区问要求下，总体的标准差越大，所必须抽取的样本容量相应（）

[问答题]In this section, there is one passage followed by a summary. For Questions 1 to 5, please read the passage carefully and complete each space in the summary using a maximum of three words from the passage. Remember to write the answers on the Answer Sheet.　　Questions 1 to 5 are based on the following passage.Blacks in Business　　A fundamental question for blacks beginning to move into management ranks in the postwar era: how to maintain a black identity while climbing the corporate ladder. Advancement in America’s predominately white companies called for adjustments on the part of blacks. Fleming Golden, a thirty-four-year-old black executive, recalled the changes he had to make at IBM. “I was always a flashy dresser. I had lots of orange and green suits,” he observed. Then one day an older white guy took aside and said, “Hey, don’t get offended, but it’s about those suits you wear. They just don’t blend in at IBM.” Golden also gave up playing basketball with his black friends after work in favor of golf with other IBM executives. For Golden these changes worked, and he got ahead. But the pressures of trying to remain black in the white corporate world were sometimes overwhelming. Most blacks never enjoyed even the opportunity to try to succeed in white-owned businesses. While they make considerable gains during the 1980s, blacks nonetheless remained grossly underrepresented in U.S. management ranks at the close of that decade. Moreover, of those few blacks in management, only a handful had made it into top management in big businesses. Black capitalism—black ownership of businesses—offered some hope for blacks excluded from management in white businesses. As we have seen, black-owned businesses have long existed in the United States, some serving primarily black communities. Despite this progress, black enterprise remained small when compared with leading non-black businesses. No black-owned business made Fortune’s list of the top five hundred industrials until the 1990s.Summary:

[单选题]在下列灭火系统中，可以用来扑灭高层建筑内的柴油机发电机房和燃油锅炉房火灾的灭火系统是（　）。

[问答题]气压制动系主要由哪些零部件组成？并简述其基本工作情况。

[单选题]下列不属于阴证溃疡的特点是（）。

[单选题]甲、乙、丙、丁四人共同投资一个项目，已知甲的投资额比乙、丙二人的投资额之和高20％，丙的投资额是丁的60％，总投资额比项目的资金需求高。后来丁因故临时撤资，剩下三人的投资额之和比项目的资金需求低，则乙的投资额是项目资金需求的（　　）。

[判断题]在我国，居住用地的使用权出让最高年限是50年。

[填空题]被判处（）的犯罪分子，执行原判刑期1/2以上，可以假释。

[单选题]肺隔离症的CT表现，错误的是（　）

[单选题]用万用表欧姆档测量二极管时，通常将量程选在（）档。

[单选题]童年期儿童的主导活动是（）。