【单选题】设随机变量X满足D(10X)=10,则DX=
【单选题】美国心理学家佛兰克·法利提出( )性格,认为这是一种好冒险、喜欢刺激的性格特征。
【单选题】美国心理学家佛兰克·法利提出()性格,认为这是一种好冒险、喜欢刺激的性格特征。
【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 .
【单选题】The box of bricks hit the man because ______.
A.
the box of bricks was heavier than him
B.
the box of bricks was lighter than him
C.
the box of bricks came down too fast
D.
the man was too careless
【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.