封闭型扩散
closed type atmospheric dispersion
超狭长两端封闭空间
very long-narrow sapce with two closing ends
封闭、半封闭空间
hermetic and half-hermetic spaces
封闭空间构成要素
elements of composition in closed space
小尺度封闭空间
small enclosures
small enclosure
charge mixture production line
small-enclosed room
Small enclosed-room
地球轨道之倾斜
earth’s orbit inclination