plane concave antenna.
平凹形天线
Plane mirrors, convex lens and concave lens.
平面镜、凸透镜和凹透镜。
A plane with a concave blade for making moulding with beadwork.
有凹刃可以用珠缘来浇铸的刨子。
A polyhedron some of whose plane sections are concave polygons.
有些平面部分是凹型多边形的多面体。
A plane with a flexible face that can plane concave or convex surfaces.
有可以刨凹面或凸面的曲面的刨子。
At least one loop of absorption blind hole is evenly distributed around the segmental concave cavity along the radial direction of plane.
径向面上沿圆缺凹腔周围均匀分布不少于一圈的吸收盲孔
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