The system structure and the mathematic model of least square method to evaluate the straightness er2 rors are introduced.
介绍了系统结构原理以及空间直线度误差的最小二乘评定法数学模型。
By comparison, RORs account for 56.2% of crashes on urban roadways.
相比之下，城市道路中，ROR事故的比率约为56.2%。
By comparison, RORs account for 56.2% of crashes on urban roadways.
相比之下，城市道路中，ROR事故的比率约为56.2%。
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