Among them, DHV-1 is the most virulent, since the mortality rate can reach high up to 80% once ducklings infected within 3 weeks old.

三种鸭肝炎病毒以DHV - 1病原性最强，当3周龄以内之小鸭感染DHV - 1病毒时，其致死率高达80%以上。

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This paper develops a DSP - based Downhole Video (DHV) acquisition system and the approach to compress the data, which is suitable in high temperature conditions.

提出了一种基于DSP的井下电视(DHV)视频采集系统及数据压缩方法，适合较高温度下的工作环境。

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DHV requires the parachute to open in less than 60 vertical meters when the load (simulating the pilot) and the parachute are dropped in free fall, side by side, at the same time.

而DHV要求在带着模拟飞行员必须在60米的垂直下落距离内打开，下抛时备份伞是同假人处于同一高度并列放下。

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DHV requires the parachute to open in less than 60 vertical meters when the load (simulating the pilot) and the parachute are dropped in free fall, side by side, at the same time.

而DHV要求在带着模拟飞行员必须在60米的垂直下落距离内打开，下抛时备份伞是同假人处于同一高度并列放下。

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