【单选题】Photoshop中利用仿制图章工具F型不锈钢齿轮泵操作时,首先要按什么键进行取样。 ( )
【判断题】与逻辑关系可以用“有0出0,全1为1”来描述。
【简答题】设随机变量X服从二项分布,即X~B(n,p),且E(X)=3,p= ,则n=________,V(X)=________.
【单选题】设随机变量 X ~ B ( n , p ) ,且 E ( X ) = 4.8 , D ( X ) = 0.96 ,则参数分别是 ( )
【简答题】On his way back home, he found his wallet ______ (miss).
【单选题】( )'A new idea began to ____from his mind when he was on his way back home.