GPS技术是地理信息系统，这种说法。()

Once a would-be entrepreneur has identified what he or she thinks is a promising unmet need, he or she should evaluate and identify the risks that should be considered in deciding whether or not to pursue that business opportunity.() 点击查看答案&解析

速度势函数()。

A.满足拉普拉斯方程
B.在不可压缩流体中满足拉普拉斯方程

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