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bolt circle
auto. 轮辋螺栓分布圆; 螺栓孔圆; 螺栓孔分度圆
avia. 螺栓圆; 螺栓分布图; 螺孔中心图
dril. 法兰螺栓孔中心圆
mech. 螺栓分布圆
bolt circle: 15 phrases in 5 subjects
Automobiles5
Aviation2
Electric machinery3
Mechanics2
Technology3