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Estimating schedule activity costs involves developing an (1) of the cost of theresources needed to complete each schedule activity. Cost estimating includes identifying and considering various costing alternatives. for example, in most application areas, additionalwork during a design phase is widely held to have the potential for reducing the cost of the execution phase and product operations. the cost estimating process considers whether the expected savings can offset the cost of the additional design work. cost estimates are generally expressed in units of (2) to facilitate comparisons both within and across projects.the (3) describes important information about project requirement that is considered during cost estimating. 空白（1）处填（）
虚里位于（）。
下列药物中，不属于兴奋剂的是（）
未来我国流动人口将呈现三层格局。第二层是以（）等中西部城市群为中心的中西部产业承接带。
女性，68岁，因子宫内膜癌行盆腔廓清术后3天，诉左小腿轻度疼痛。查体：左足轻度可凹性水肿，左腓肠肌压痛且足背伸时疼痛加剧，足背动脉搏动好。最简捷的诊断方法是（）。
国内袋牌条码信息第17位为本转代码，代码（）表示本转混封。
心肌纤维横纹不及骨骼肌的明显，是由于其肌原纤维不及骨骼肌那样规则，肌丝组成粗细不等的肌丝束
输氧管道内的金属微粒不会引起管道爆炸。
光纤是由（）组成。而光缆则是由众多的（）组成。
喇叭无故蜂鸣、尖叫、报警或演奏某种音乐，是计算机感染病毒的一种症状。
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