这个标志是何含义?()
A.观景台
B.停车场
C.休息区
D.停车位
参考答案:A
________ countries and areas have been seriously hit by the typhoon. Now people in the affected
areas are ______food and fresh water.
A.A number of; lacking in
B.The number of; lacking in
C.A number of; lacking of
D.The number of; lacking of
设随机变量的概率密度为,则a的值是()。
A.A
B.B
C.C
D.D