The disturbing point massds model has aroused great interest in geodetic community as a method of approximating the external gravity field of the earth.
扰动质点模型作为地球外部重力场的一种数值逼近方法，已经引起人们极大的兴趣。
The utility model provides a multi-functional neutral pen which can fluently write under the zero gravity state or when the gravity does not point to the component force of a pen point.
本实用新型提供一种多功能中性笔，使其在失重状态或重力无指向笔尖分力时也可流利 书写。
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