1)center roof vent,中心通气孔2)center vent,中心空孔;中心放气孔;中心通风孔3)central hollow,中心气孔4)core vent,砂心通气孔5)core box vent,砂心盒通气孔6)Air Admission to Main Shaft Central Hole,主轴中心孔补气
用法例句
The reasons of the central hollow formation inside Ni-base alloy ingot from electro-remelting with slag pool are analyzed and the mechanism of the central hollow formation is discussed.
