【正文】
資均相同,建設(shè)期均為 1年,從第二年開始投產(chǎn),投產(chǎn)后 5年就把礦藏全部開采完。 5年中每年的營業(yè)收入增加60000元,每年的付現(xiàn)成本為 20220元。 ? English Studying ? ( 1) have no acquaintance with (take words book to memorize) ? (2) reading prehension_recognize, have no name, characteristic about them ? (3) have a copy to study seriously( English book , Test paper in the past years) appearance frequentl