【单选题】在房地产市场调查的类型中,房地产价格调查属于( )。
【单选题】The early electric cars gradually disappeared because of______.
A.
gasoline-powered cars.
B.
technological restrictions.
C.
lacking government's support.
D.
no profits and unfeasibility.
【单选题】According to the passage, electric and hybrid cars failed to capture the American automotive market in the early twentieth century because of what factor?
A.
The improvement in cost and performance of gasoline-powered cars
B.
The superior fuel efficiency of hybrid cars
C.
The substandard performance of steam-powered cars
D.
Consumer fear of being electrocuted by gasoline-electric hybrids
E.
Government subsidies for gasoline- and coal-powered cars
【单选题】若事件 与 相互独立,且 ,则 的值等于
【单选题】若A与B相互独立,且P(A)>0,P(B)>0,则下面不相互独立的事件是( ).
【判断题】(10)若变量A与二维变量(B, C)相互独立,且变量B与二维变量(A, C)相互独立,则变量A, B, C相互独立。