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以上来源于: WordNet
N the differential operator (∂/∂x) + (∂/∂y) + (∂/∂z), where , , and are unit vectors in the x, y, and z directions 倒三角算子 ( symbol: ∇Also called nabla) [maths]
The company has a perfect system of R&D, production, quality guarantee and alter-sales service, The products conclude LED display series, LED lamp series LED backlight series, EL series, etc.
公司现已形成了完善的设计、开发、生产、质量保证和售后服务体系。
Burnett, Graham D. Masters of All They Surveyed: Exploration, Geography, and a British El Dorado. Chicago: University of Chicago Press, 2000. ISBN: 0226081206.
巴涅特，格雷厄姆D。《所有调查的主导者：探索，地理学和大不列颠的黄金国》。芝加哥：芝加哥大学出版社，2000。ISBN：0226081206。
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