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elliptical head
avia. 椭圆头; 椭圆顶; 椭圆磁头
chem. 圆圆封头
el. 椭球形封头; 压力容器椭圆形封头
oil 椭圆封头; 椭圆头盖
elliptic head
tech. 椭圆封头
elliptical head: 4 phrases in 2 subjects
Oil / petroleum1
Technology3