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2021-09
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2020-11
螺杆（gǎn）是可以與螺母一起使用的工具。它具有很重要的目的。它（tā）不（bú）僅可以用作某些（xiē）管道的連（lián）接按鈕，而且在某些設備的（de）安裝...
