The common units of pressure include ( ).
A. SI unit
B. Manometric unit
C. Atmospheric pressure (atm)
D. Hydraulic unit
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Two fluid flow patterns are______ ; Reynolds number can be used to judge the flow pattern. The expression of Reynolds number in circular pipe is Re=______ , and the corresponding critical value of Re is______ .
设有广义表D=(a,b,D),其深度为( )
A. ∞
B. 2
C. 5
D. 3
如果带权有向图G采用邻接矩阵存储结构来存储,设其邻接矩阵为A,那么顶点I的入度等于A中( )
A. 第I行非无穷和元素之和
B. 第I列非无穷和元素之和
C. 第I行非无穷且0的元素个数
D. 第I列非无穷的元素个数
设语句X++的时间是单位时间,则语句的时间复杂度为( ) for(I=1;I<=n;I++) x++;
A. O(1)
B. O(n)
C. O(n2)
D. O(n3)