The calculation on area of the Fyesnel's half wave zone is not accurate in many teaching materials. The mistake is pointed out, and a correct solution is given.

指出了光学教材中，菲涅耳半波带面积计算中的不合理近似及其错误结论，并提出正确的解决方法。

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But answering the urgent question on 22 March 2012, Exchequer Secretary David Gauke said he had no knowledge of any specific leaks and pointed out that there had been several inaccurate reports, as well as accurate ones.

BBC: Labour calls for inquiry into Budget leaks