摘要:图中C处陡崖最大相对高度可能为. A.390m B.420m C.220m D.180m

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读“我国东部沿海的地区图”,回答:
(1)写出图中字母代表的我国最大海洋渔场和当前重点开发区的名称: 
    A:________渔场;B:________重点开发区;C:________重点开发区;D:________重点开发区。
(2)图中A处形成我国最大海洋渔场的原因___________                                                        ________                                                 _。
(3)比较B、C两重点开发区发展钢铁工业的优势和不利因素。
                                                                                                                                                               
                                                                                                                                                               
(4)结合D重点开发区的气候、草场和海洋等方面的资源优势,确定当前及今后开发重点,应在本区建成哪些农业生产基地?
                                                                                                                                                               
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