【多选题】【消耗次数：1】
下列属于确定机械台班定额消耗量的基本步骤的是（）。
①
确定机械纯工作
②
确定机械一小时纯工作正常生产率
③
确定机械的正常利用系数
④
计算施工机械台班定额
⑤
计算机械一小时纯工作正常生产量
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