And every planet with a solid surface bar Mercury has been landed on.
每一个有固体表面的行星，除了水星以外都有机器人登陆。
An operation whereby the surface of a bar is ground without using a lathe.
无须使用车床就可以研磨棒材表面的操作。
A rolling finishing method for stainless steel bar surface conditioning is put forward.
提出了用连续滚压的方法对不锈钢钢筋进行表面精整。
A rolling finishing method for stainless steel bar surface conditioning is put forward.
提出了用连续滚压的方法对不锈钢钢筋进行表面精整。
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