单选题:由于外部性经济效果可以分为(  ),所以在城市规划中要分析研究城市中各种经济活动的得失,充分利用外部性正效果,以便求得最

题目内容:
由于外部性经济效果可以分为(  ),所以在城市规划中要分析研究城市中各种经济活动的得失,充分利用外部性正效果,以便求得最佳的整体城市效益。 A.正效果和负效果
B.好效果和坏效果
C.正面因素和负面因素
D.好的因素和坏的因素
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答案解析:

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