皮皮学，免费搜题
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【单选题】
下列哪个器官被覆盖单层柱状上皮A.
血管
B.
小肠
C.
皮肤
D.
食管
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举一反三
【简答题】Trees are useful to man in three very important ways. The first important way is that they provide man with food，wood and other products. Trees provide man and animals with food to live on the earth. ...
【简答题】Hear to me carefully. What I‘m saying is very important.
【简答题】Trees are useful to man in three very important ways. The first important way is that they provide man with food, wood and other products. Trees provide not only man with food, but also many animals w...
【单选题】将两个各有N个元素的有序表归并成一个有序表，其最少的比较次数是( )。【中科院计算所1998二、7(2分)】【中国科技大学1998二、7(2分)】
A.
N
B.
2N-1
C.
2N
D.
N-1
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