There's also a tweezer and toothpick and a hole for lanyard attachment.
还有一个镊子和牙签和一个系绳的接孔。
The paper respectively studies the principles and features for profiling attachment and slider crank mechanism to be used as clamping apparatus to fabricate oval hand hole cover.
分别对凸轮靠模和曲柄滑块机构作为工装加工椭圆手孔盖的原理及特点进行了探讨。
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