Autonomous spending is the amount of demand that an economy will have with no income, in other words, that does not depend on income.
自发支出是一个经济体在美有收入时的需求量，也就是是说它并不依赖于收入。
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Since the demand for autonomous underwater vehicle (auv) "s voyage ability has improved, how to solve the navigation precision has became a key problem".
On the demand of autonomous quality, concealment and higher precision of underwater vehicle, navigation system must take INS as the core and be assisted by other navigation systems.