单项选择题

He checked carefully to _______ the possible errors in his design.

A、eliminate
B、exceed
C、enlarge
D、vibrate

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单项选择题

A _____ sentence has one or more clauses besides the main clause.

A.complicate
B.complex
C.complication
D.complexion

单项选择题

设根结点的层数为0，若高度为h的二叉树上只有度为0和度为2的结点，则此二叉树上所包含的结点数至少为()。

A.h+1
B.2h-1
C.2h
D.2h+1