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position indicating mark
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position indicating mark
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工学
水运交通指示
释
position indicating mark
示位标
设在湖泊、水库、水网地区或其他宽阔水域与重要航道附近,标示岛屿、浅滩、礁石及通航河口等特定位置,供船舶定位或确定航向的水上助航标志,又称灯塔。在内河航道可以为各种形状的塔形体。塔身外涂有显明的颜色,便于船舶识别。
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functor preserving limit
functor Tor
fund accounting
fundamental
fundamental absolute retract
fundamental algebraic subvariety
fundamental astrometry
fundamental astronomical constant
fundamental astronomy
fundamental attribution error
fundamental basis
fundamental bass
fundamental bond
fundamental bracket
Fundamental Catalogue
fundamental cell
fundamental circle
fundamental circuit
fundamental class
fundamental cocycle
fundamental cohomology class
fundamental combinant
fundamental commutation relations
fundamental component
fundamental concept
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