某分部工程单代号网络计划如下图所示，其中关键工作有（）。
Ａ工作Ｂ Ｂ工作Ｃ
Ｃ工作Ｄ Ｄ工作Ｅ
Ｅ工作Ｇ
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某项目第一年初投入１０万元，第二年末投入５万元，第三年初投入１万元，第四年初投入２万元。该过程的现金流量图为（）。
设函数f(x)在[a，b]上等于sinx，在此区间外等于零，若f(x)可以作为某连续型随机变量的概率密度，则区间[a，b]应为（）
A．speechesB．soundsC．wordsD．voices
A. speeches
B. sounds
C. words
D. voices
What conclusion can be drawn from the passage？
A. The organization for the Olympic Games must be improved.
B. Athletes should compete as individuals in the Olympic Games.
C. Sport should be played competitively rather than for the love of the game.
D. International contests are liable for misunderstanding between nations.
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