变量是程序中的基本存储单元之一，由变量名、变量类型、变量属性、 ______ 组成。
参考答案：常量
对正弦信号进行采样得到的正弦序列必定是周期序列。（）
How big is the house he moved in().
A.As big as the old one.
B.Twice as big as mine.
C.As big as mine.
D.Twice bigger than mine.
