问题描述：
英语翻译
The1/2" - 14 NPT threadings must allow the handtight engagement of the taper pipe thread plug gage from 8 mm to 9mm（with number of engaged threads between L1 and L1+1)
括号里的L1和L1 +1 是什么?螺纹规?
The1/2" - 14 NPT threadings must allow the handtight engagement of the taper pipe thread plug gage from 8 mm to 9mm（with number of engaged threads between L1 and L1+1)
括号里的L1和L1 +1 是什么?螺纹规?
问题解答：
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