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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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glass fibre reinforced plastic
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glassine
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glass liquid thermometer
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glass matrix composites
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glass phase
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