DB65 T 4360-2021 灌溉水有效利用系数测定技术规程.pdf

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TB T 2216-1991 内燃机车辅助功率消耗率、传动效率、功率利用系数、轮周效率评定方法.pdf

GB T 24811.2-2009 起重机和起重机械.钢丝绳选择.第2部分 流动式起重机 利用系数.pdf

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