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航海六分仪
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航海六分仪
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marine sextant
航海六分仪
手持式,用以测量天体高度或物标夹角的精密光学仪器,因其分度的弧长约为圆周长的1/6而得名,是古老的用以测定船舶位置的航海仪器。
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directional explosive echo ranging
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directional gamma-ray radiometer
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directionality
directionality in translation
directional light source
directional limit
directionally intersected wells
directionally solidified columnar superalloy
directionally solidified eutectic superalloy
directionally solidified superalloy
directional machine
directional mutation
directional partial derivative
directional pattern
directional pattern of microphone
directional pinpoint blasting
directional power protection
directional quantization
directional reflectomography
directional selection
directional selectivity
directional sensor network
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