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【单选题】
Believe it or not, no one can afford to deny or ignore the tiny sparkle of an idea, especially in a/an 【C1】______ of knowledge explosion. Like any other aspects of the computer age, Yahoo began as an idea, 【C2】______ into a hobby and lately has turned into a full-time passion. The two developers of Yahoo, David Filo and Jerry Yang, Ph. D candidates 【C3】______ Electrical Engineering at Stanford University in the United States, started their 【C4】______ in April 1994 as a way to keep 【C5】______ of their personal interest on the Internet. Before long they found that their homebrewed lists were becoming too long and 【C6】______ . And gradually they began to spend more and more time on Yahoo. During the year of 1994, they 【C7】______ Yahoo into a customized database designed to 【C8】______ the needs of the thousands of users that began to use the service through the closely 【C9】______ Internet community. They developed customized software to help them 【C10】______ locate, identify and edit material 【C11】______ on the Internet. The name Yahoo is 【C12】______ to stand for 'Yet Another Hierarchical Officious Oracle', but David Filo and Jerry Yang insist that they select the 【C13】______ because they considered themselves yahoos. Yahoo itself first 【C14】______ on Yang's workstation, 'akebono', while the search engine was 【C15】______ on Filo's computer, 'Konishiki'. In early 1995 Marc Andersen, one of the 【C16】______ of Netscape Communication in Mountain View, California, invited Filo and Yang to move their files 【C17】______ to larger computers 【C18】______ at Netscape. As a result Stanford's computer network returned to 【C19】______ and both parties benefited from this issue. Today, Yahoo 【C20】______ organized information on tens of thousands of computers linked to the web. 【C1】
A.
time
B.
era
C.
phase
D.
epoch
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【单选题】参数为c的指数分布概率密度函数p(x),×≥0时p(x)=c exp(-c x); 否则p(x)=0,若一个随机变量Y服从参数为c的指数分布,则在一次随机试验中,概率P(Y≥1/c)等于 ( )
A.
1/e
B.
2/e
C.
3/e
D.
1/2
【单选题】影响舵效的主要因素是()。 ①舵角大小; ②流经舵面的流速; ③船的转动余速; ④风流、浅水等海况; ⑤舵机性能。
A.
①②③④
B.
②③④⑤
C.
①③④⑤
D.
①②④⑤
【单选题】SELECT语句执行的结果是
A.
数据项
B.
元组
C.
视图
D.
【判断题】当没有开锁动作时,开锁装置应自动保持在锁紧状态。( )
A.
正确
B.
错误
【多选题】项目的经济效益评价指标中,贴现指标包括
A.
内部收益率
B.
获利指数
C.
净现值
D.
会计收益率
【简答题】设X的概率密度函数为: (x>0, V>0), 若Y1,Y2,...,Ym独立且同服从指数分布E(λ),令X=Y1+Y2+...+Ym, 则X服从n阶爱尔朗分布.请采用卷积法生成爱尔朗分布的随机变量.
【判断题】当没有开锁动作时,开锁装置应自动保持在锁紧状态。( )
A.
正确
B.
错误
【判断题】投机动机的货币需求是利率的减函数。
A.
正确
B.
错误
【单选题】下列哪种药物的镇静作用最弱
A.
氯丙嗪
B.
安定
C.
丙米嗪
D.
锂盐
E.
氟哌啶醇
【单选题】若随机变量X的密度函数为 则X服从( )分布
A.
N(1,2)
B.
N(1,1)
C.
N(2,2)
D.
N(0,1)
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