... 直管螺纹straight pipe thread 梯形螺纹 trapezoid thread 螺距pitch of thread ...
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trapezoid thread lathe tool 梯形螺纹车刀
trapezoid multi-start thread ring 梯形多头螺纹环
trapezoid multi-stfine art thread ring 梯形多头螺纹环
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For being connected with another slope child body-building equipment, the extension part of the upper end of the right-angled trapezoid plate is provided with a hard thread gluing.
为了连接另一斜坡幼儿健身器材，在直角梯形板材的上端外延处设有硬粘扣。
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