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left-hand thread

compr. 左螺纹
mech. ★ 左旋螺纹
oil 反扣
seal. 反扣螺纹
tech. 左旋螺纹; 反螺纹
left hand thread
space 左旋螺纹; 倒牙
left-hand thread
: 10 phrases in 4 subjects
Architecture1
Drilling3
Oil / petroleum2
Technology4

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