【多选题】【消耗次数：1】
机械设备的技术先进性应体现（）
①
A以生产适用为前提
②
B以获得最大经济效益为目的
③
C不可脱离企业的实际需要而片面追求技术上的先进
④
D技术上在一段时间内不落后
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