(3)材料三中提到珠江三角洲的“优势弱化”是指?与之相比长江三角洲经济迅速发展的有利条件有? _________________________________________________________________________________________ _________________________________________________________________________________________ (4)材料四中珠江三角洲产业向粤东、粤西、粤北转移:这种产业转移对移出地和移入地的影响分别有 哪些? _________________________________________________________________________________________ _________________________________________________________________________________________ _________________________________________________________________________________________ _________________________________________________________________________________________(5)请就如何实现珠江三角洲产业可持续发展提出您的建议。 _________________________________________________________________________________________ _________________________________________________________________________________________ _________________________________________________________________________________________