【单选题】设随机变量X满足D(10X)=10,则DX=
【简答题】Golden bricks are made of ___________________.
【简答题】设随机变量X满足E(X)=3,D(X)=5,求E(X+2) 2 .
【判断题】Golden bricks are made of gold.
【单选题】________ at the golden belt of Yangtze River Delta, Ma'anshan is the National Garden city _______ wonderful landscape appeals to many visitors every year.