2.若,则是复数是纯虚数的( )
A.充分非必要条件 B.必要非充分条件
C.充要条件 D.既不充分也不必要条件
1.已知集合则集合=( )
A. B. C. D.
34.(10分)
(1)_____________________________________________,
_____________________________________________,
_______________________________________。(3分)
(2)_____________________________________________,
_______________________________________。(2分)
(3)_________________________________________________________________________
________________________________________________________________________________________________________________________________________________________________________________________________________________。(5分)
33.(7分)
(1)________________________________________,
_______________________________________________________________________________________________________________________________________________________________________________________________________________。(3分)
(2)_________________________________________________________________________
________________________________________________________________________________________________________________________________________________________________________________________________________________。(4分)
32.(9分)
(1)________________________________________,
_________________________________(山名)。(2分)
(2)_________________________________________________________________________
________________________________________________________________________________________________________________________________________________________________________________________________________________。(7分)
31.(14分)
(1)_________________________________________________________________________
________________________________________________________________________________________________________________________________________________________________________________________________________________。(4分)
(2)_________________________________________________________________________
________________________________________________________________________________________________________________________________________________________________________________________________________________。(5分)
(3)_________________________________________________________________________
________________________________________________________________________________________________________________________________________________________________________________________________________________。(5分)
33.读下图,回答下列问题。(7分)
(1)上右图所示地区的农业地域类型主要是_______________,相对于上左图所示地区其农业生产的最主要优势自然条件是__________________________________。(3分)
(2)比较包头钢铁企业和宝山钢铁企业各自发展的优势区位条件。(4分)
31.读图,回答下列问题。(14分)
(1)图中A、B区域盐碱地分布较广,
其形成与水盐运动有关,试分析
水盐运动的过程。(4分)
(2 ) 图中C地区水土流失严重,
试分析其自然原因。(5分)
(3)图中D河中下游洪涝灾害严重,
试分析洪涝发生的自然原因。(5分)
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