“bertrandite”的概念、定义、翻译、参考文献-科学参考

单词	bertrandite
释义	bertrandite [`bǝr·trǝn´dīt] ^MINERALOGY Be₄Si₂O₇(OH)₂ A colorless or pale- yellow mineral consisting of a beryllium silicate occurring in prismatic crystals; hardness is 6-7 on Mohs scale, and specific gravity is 2.59-2.60.
随便看	directivity factor directivity index directivity pattern direct keying device direct labor direct labor standard direct-line drive directly heated cathode direct material direct memory access direct motion direct nuclear reaction direct numerical control director director circle direct organization director-sight system director-type computer director-type fire control directory direct outward dialing direct pickup direct piezoelectricity direct plate exposure direct pointing

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