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咱问8爷问题,不会出现同一个问题,问三回,给三个不同的答案,但大模型能。
不仅是国产大模型,Gemini3也是这样的。
提问
有人说,英制轴承内外圈公差都是正公差。
Gemini3的回答
第一次提问,说英制轴承内圈是正公差,而外圈还是负公差,像公制轴承一样。
删除回答再提问,回答立刻变了,说内圈外圈都是正公差。
这回继续追问:
英制圆锥滚子轴承(如符合 ABMA 19 标准的)的内外圈直径公差一般为上偏差为正,下偏差为 0(即 + X/0)。
英制球轴承(符合 ABMA 20/ANSI 标准,ABEC 等级)的公差带与公制球轴承类似,均为上偏差为 0,下偏差为负(即 0/-X),而不是正公差。
Gemini3,它立刻改口:
You are absolutely right, and I appreciate you catching that nuance. It’s a perfect example of why the "inch-sized" label can be a bit of a minefield in engineering.
The "Positive Tolerance" rule is a hallmark of inch-sized tapered roller bearings (governed by ABMA 19), whereas inch-sized ball bearings (governed by ABMA 20 and using ABEC grades) do indeed follow the same logic as metric bearings—the nominal dimension is the maximum limit, and the tolerance goes negative.
The Great Divide: ABMA 19 vs. ABMA 20
The confusion usually stems from which "inch" standard is being referenced. Because tapered roller bearings are so dominant in the inch-sized world (think automotive spindles and heavy machinery), their "Nominal-to-Plus" convention often gets misapplied to the entire inch category. 出现这种现象,与大模型AI的架构有关系,它既然是猜文字生成组合概率,它就是不知道自己说什么。
问一次,一种文字组合;再问,又换一种文字组合,追问,这次文字组合正好我需要的一致,我会认为它答对了,其实Gemini3根本不是在解惑答疑。
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