【单选题】
时间线轨道上的两段相邻片段,片段A的入点为5秒,出点为12秒,片段B的入点为12秒,出点为18秒。这两个片段之间施加一个矩形划像切换,切换的对齐方式为End atcut,切像切换的入点为8秒。那么,划像持续的时间为:
【单选题】
以下属于音频信号的无损压缩编码方法的是_______。
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[privilege; component; stagnant; entangle; superficial; arresting; expound; penetrating; indulge; click]2. On the right,[填空1]the title bar(but not the title itself) for the business space or the page.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[set off; after all; attach to; burst into laughter; lean against; teach...a lesson; take off; come to sense; give in to]10. A sensible Tory should think hard about events themselves, not about the labels which others[填空1]them.
【简答题】
Directions: Fill in the blanks with the phrases given below. Change the form if necessary.[comprise of; vote for; access to; wake up; be hooked to; in the long run; work at; to ones joy; pay off; be associated with]9. Now its your turn to talk. Are you[填空1]the Internet?
【简答题】
设二维随机变量(X,Y)只取下列数组中的值:(0,0)(0,1)(1,-1)(2,-1)且相应概率依次为1/4,1/6,1/3,1/4。(1)列出(X,Y)的概率分布表;(2)分别写出关于(X,Y)的边缘分布;(3)求E(X+Y)。
【简答题】
已知E(X)=1,E(Y)=2,E(XY)=3,则X,Y的协方差Cov(X,Y)=[填空1]
【简答题】
设P(A)=0.4,B为A的对立事件,则P(B)=[填空1]
【判断题】
对于事件B,若P(B)=1,则B一定为必然事件。