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天井
连接上下两个中段,提升或下放设备、工具和材料,或者用于通风、行人及探矿等目的的简易井筒。是在非煤矿山的矿块内,沿矿床掘进直立或倾角较大的简易井筒。位于中段以上的倾角较大的简易井筒又称上山,位于中段以下的倾角较大的简易井筒又称下山。
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aircraft flyover synchronization
aircraft for calibrating airport facilities
aircraft force test in wind tunnel
aircraft fuel system
aircraft fuel system test
aircraft fuel tank access covers fire resistant test
aircraft fuel tank sealing test
aircraft functional hazard assessment
aircraft fuselage structure
aircraft general actuation system
aircraft general quality characteristics test
aircraft ground effect test in wind tunnel
aircraft ground test
aircraft ground test of weapon carried
aircraft ground tests of flight control system
aircraft hazard probability
aircraft hazard severity
aircraft health management system
aircraft high angles of attack unsteady aerodynamic test in wind tunnel
aircraft high temperature test
aircraft hijacking
aircraft hinge-moment test in wind tunnel
aircraft hydraulic actuation system
aircraft hydraulic system
aircraft hydraulic system test
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