Dvd double cover packing , dsd audiophile digital composed Dvd双封面封套包装， dsd发烧数码编制
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On cycle double cover problems 双圈覆盖问题
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Dcy double covered yarn 双包覆纱
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Double cover design 双封面设计
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Double cover vcd 双封面vcd
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The record company also released the album with a double cover design , this is the only album of sam hui that has this feature 公司不惜工本以双封套唱片包装，亦是许冠杰唯一有双封套设计的唱片。
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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 众所周知，一般的反问题和混合问题的最大特点，是在给定的压力面和吸力面上的压力分布或速度分布条件下，直接得到叶片的几何形状，它可以使叶型型面与表面气流参数有机结起来；其不足之处在于，对设计者而言，很难给定理想的叶片表面压力分布或速度分布，并且有时会得到一个非物理解，如：得出的初始叶型可能会出现前缘、尾缘不封闭的现象。
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