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【简答题】
在自然推理系统P中构造下面推理的证明: 前提:p→(q→r), p, q 结论:r∨s
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举一反三
【单选题】The people you find most diffcult can also be your most valuable teachers.
A.
dealing with
B.
to be dealt with
C.
to deal with
D.
being dealt with
【单选题】The author suggests that the most valuable resource in todays society is______.
A.
technology
B.
economic assets
C.
access to information
D.
time
【简答题】丝网波纹填料是用 制成的,它质地细薄、结构紧凑、组装规整。
【单选题】For centuries the most valuable of African resources for Europeans were the slaves, but these could be obtained at coastal ports, without any need for going deep inland. Slavery had been an establishe...
A.
the Europeans were innocent in the trade of African slaves.
B.
slavery in Africa and in the West was the same in nature.
C.
the view in the most recent studies of enslavement is baseless.
D.
slaves had been treated even more cruelly in the African tradition.
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