从无章可循到协调税则（HTs），从主规则（primary rule）到处理剩余事项规则（residual rule）,最终历时40年形成了原产地规则协定。该协定是第一个将统一的原产地规则与GATT挂钩的多边协议。
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"We have very little residual rule-making capacity," says one regulator.
“没有给我们剩下多少制定规则的能力了。”其中一位监管人员说。
Finally, they noted that they could not rule out the possibility of residual confounding.
最后，他们指出尚不能除外残余混杂的可能性。
Big and small of residual error and rule of sign change was observed with inspection method of residual error, and if it had system error or rough error and so on was identified.
采用残余误差观察法观察残差图中各个残余误差大小和符号变化规律，可直接判断有无系统误差。
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