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double cover 二盯一〔賽球時以兩名隊員盯住對方一名進攻手〕。

double cross

As we know , inverse techniques make blade ' s profile well compatible with its surface velocity distribution , however , they give designers big challenges that the ideal velocity distribution is hard to obtained and sometimes the non - physical solution , such as double covering of flow field or unclosed profiles , would come out . the proposed design procedure in the paper has avoided the disadvantage mentioned above . in this paper , a quasi - irrotational equation is used to describe the flow in cascade instead of the generally used irrotational equation 眾所周知,一般的反問題和混合問題的最大特點,是在給定的壓力面和吸力面上的壓力分布或速度分布條件下,直接得到葉片的幾何形狀,它可以使葉型型面與表面氣流參數有機結起來;其不足之處在于,對設計者而言,很難給定理想的葉片表面壓力分布或速度分布,并且有時會得到一個非物理解,如:得出的初始葉型可能會出現前緣、尾緣不封閉的現象。

The record company also released the album with a double cover design , this is the only album of sam hui that has this feature 公司不惜工本以雙封套唱片包裝,亦是許冠杰唯一有雙封套設計的唱片。

Double cover vcd 雙封面vcd

Double cover design 雙封面設計

Dcy double covered yarn 雙包覆紗

On cycle double cover problems 雙圈覆蓋問題

Dvd double cover packing , dsd audiophile digital composed Dvd雙封面封套包裝, dsd發燒數碼編制