It is well-knownthat the detachment condition for conical shock wave is a necessary condition on which whether a prediction is valid or not can be examined theoretically.
我们知道,理论上能检验脱体波计算合理与否的必要条件是圆锥激波脱体条件。
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It is not impossible, a local administrative regulations may notbe so wellknown, this is worrying, it seems that the grass-roots law popularization of education, there are still many blind spots.