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swimmi 發(fā)表于 2021-6-15 14:08 感謝指點(diǎn),豁然開(kāi)朗 |
| 書(shū)上“什么叫有效數(shù)字”一節(jié)里面提到了“修約誤差限”,其絕對(duì)值就是修約引入的誤差絕對(duì)值,這個(gè)值乘以2就是末位單位的量值,在這里就是修約到小數(shù)點(diǎn)后4位,選D。 |
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