A cylinder (Fig. 1) is a hollow tube with a closed concave base that permits the cylinder to stand upright.
钢瓶(图1)是中空的管道,封闭的底部是凹入的,这样可以直立起来。
The base has special concave design, and can be fixed with double-sided tape.
底板有特殊凹位设计,可以直接用双面胶固定。
On the base of Hertzian stress theory we developed a new kind of disk CAM mechanism whose follower has concave circle - arc bottom.
根据赫兹应力理论,提出了一种从动件接触面形状为凹圆弧底的新型盘状凸轮机构。
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