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A nasa gravity-mapping mission uses two identical satellites-one leading, another trailing-orbiting earth together.When the leading satellite passes over an ice cap or other mass concentration, it accelerates due to relatively larger force of attraction.The trailing satellite experiences similar acceleration when it passes over the same area.
We are a large-scale joint-stock enterprise integrating scientific research, production and sales.Our leading products have crushing equipment, sand making equipment, mobile crusher, etc., Each type of product is with complete specifications. All products have passed ISO9001, CE and GOST international quality system certification.