rule of signs
... rule of rounding 舍入规则 rule of signs 正负号规则 rule of substitution 代入规则 ...
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笛卡儿正负号规则 descartes rule of signs
内力的正负号规则 Sign Rule of Internal Forces
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现在必须介绍曲率半径的正负号规则。
It is now necessary to introduce a sign convention for radii of curvature.
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