联邦税额减免优惠在最近几年中已被三次允许期满无效。
A federal tax credit for wind has been allowed to expire three times in recent years.
据此，符合减免条件的矿业权人，可以享受不同程度的探矿权、采矿权使用费减免优惠。
It will stipulate that the eligible mine owners are entitled to different degrees of lower or free charges of using the exploration and mining rights.
随着破产房产增加、高失业率危害显现以及短期的自用房税收减免优惠结束，美国房产市场也许会再次触底。
America's housing market may yet lurch down again as foreclosures rise, high unemployment takes its toll and a temporary home-buyers' tax-credit ends (see article).
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