out-of-limit variable 超限制变数
the limit of one-variable function 一元函数极限
integration of variable upper limit 变上限积分
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Warwickshire Police admit there was an issue relating to the shape of the numerals in the signs but said the variable speed limit signs were fully illuminated and clearly showed what the correct speed limit should be.
BBC: Sign error on M42 motorway may mean speeding let-off
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