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【单选题】
听力原文:The U.N. agency says a shortage of roads, rail networks, ports and energy projects in rapidly- growing Asia threatens to hold back the region's economies. At a two-day meeting in New Delhi, the U.N. agency called on Asia to invest more heavily in cross-border infrastructure projects to spur trade and investment in the region. Representatives of 20 countries attended the meeting, where a new study by Research and Information Systems, a New Delhi-based research institute, highlighted the infrastructure deficit in Asia. Which of the following statements is closest in meaning to the passage you have just heard?
A.
Economies of Asia and Pacific region will remain rapidly-growing in spite of the shortage of infrastructure.
B.
The infrastructure deficit in Asia is highlighted during a two-day meeting by representatives of 12 countries.
C.
A regional United Nations agency says Asia needs to step up investment in infrastructure to maintain the region's high growth momentum.
D.
The U.N. agency suggested Asia to invest in cross-border infrastructure projects.
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举一反三
【多选题】以下正确的if语句形式是
A.
if(x>y&&x!=y)
B.
if(x==y)x+=y
C.
if(x
【简答题】设X 1 ,X 2 ,X 3 相互独立.且X 1 ~U[0,6],X 2 ~N(0,4),X 3 ~P(2),Y=X 1 -2X 2 +3X 3 ,求EY及DY.
【单选题】William Faulkner was the writer of .
A.
Walden
B.
Uncle Tom's Cabin
C.
The Sound and the Fury
D.
Moby Dick
【简答题】(1) 设随机变量X 1 ,X 2 ,X 3 相互独立,且有 ,求P{X 1 =2,X 2 =2,X 3 =5),E(X 1 X 2 X 3 ),E(X 1 -X 2 ),E(X 1 -2X 2 ). (2) 设X,Y是随机变量,且有E(X)=3,E(Y)=1,D(X)=4,D(Y)=9,令Z=5X-Y+15,分别在下列3种情况下求E(Z)和D(Z). (i) X,Y相互独立,(ii)X,Y不相关...
【判断题】The writer of Walden is Henry David Thoreau.()
A.
正确
B.
错误
【简答题】The writer has a high opinion of Thoreau's living all by himself at Walden Pond.
【判断题】The writer of Walden is Henry David Thoreau.
A.
正确
B.
错误
【简答题】设X~N(3,2 2 ),(1)求P{2<X≤5),P{-4<X≤10),P{|X|>2),P{X>3);(2)确定c使得P{X>c}=P{X≤c};(3)设d满足P{X>d}≥0.9,问d至多是多少?
【单选题】德国狂飙突进运动的灵魂人物是
A.
康德
B.
黑格尔
C.
歌德
D.
雨果
【单选题】第二类防雷建筑物,当仅利用建筑四周的钢柱或柱子钢筋作为引下线时,可按跨度设引下线,引下线的平均间距不应大于( )。
A.
10m
B.
12m
C.
15m
D.
18m
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