_____ Men who are bald are frequently the ones who are the most authoritative on the subject of baldness.
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_____ Vests which were once popular have been out of vogue for several years.
_____ As a celestial goddess she regulated the course of the heavenly bodies and controlled the alternating seasons.
_____ I hope that someday he will learn how to be polite.
设A(D)是有向图D=〈V,E〉的邻接矩阵,其第i行中“1”的数目表示( )。
A. 顶点vi的度数
B. 顶点vi的出度
C. 顶点vi的入度
D. 顶点vj的度数