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【判断题】
设有向图G用邻接矩阵A[n][n]作为存储结构,则该邻接矩阵中第i列上所有元素之和等于顶点i的入度。A.
正确
B.
错误
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举一反三
【单选题】He spent years ________his sick mother.
A.
care about
B.
caring about
C.
care for
D.
care of
【单选题】He spent years ____ his sick mother.
A.
caring of
B.
to care of
C.
caring for
D.
to care for
【单选题】He came back to the village_____ he spent years in his childhood.
A.
which
B.
that
C.
of which
D.
in which
【简答题】溶剂提取法提取植物中成分时,可以选用的提取工艺有哪几种?它们各有什么优缺点?
【单选题】He spent years ________his sick mother.
A.
care about
B.
caring about
C.
caring for
D.
care of
【单选题】He spent years __________ to the climate in China.
A.
coordinating
B.
adjusting
C.
balancing
D.
complaining
【单选题】He spent years _______his sick mother.
A.
look after
B.
caring for
C.
take care of
D.
care
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