concave arc length [农机] 凹板弧长
concave arc bottom 凹圆弧底
size of workpiece's concave arc 工件凹弧尺寸
one-fourth concave arc milling cutter 四分之一凹圆弧铣刀
When the fluidized bed is in the structural style of a supporting plate and an air bag, the supporting plate can be a concave arc.
流化床为支撑板加气囊袋结构形式时，支撑板可为凹弧形。
The utility model relates to forceps, ends of two clamping handles of which are respectively provided with corresponding concave arc clamping jaws.
本实用新型涉及一种镊子，该镊子的两个夹柄的端部分别设置有相互对应的凹弧形夹爪。
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