A broad - band backfire antenna with LPD array as its feed is presented in this paper.本文介绍一种对数周期偶极(LPD)阵列作为馈源的宽频带背射天线.The San Antonio class Landing Platform Dock ( LPD ) hit the fleet in 2006.圣安东尼级登陆舰已在2006年服役.Objective ...
新型梳棉机在落卷时皮板输送带(或皮圈,围裙)运行受阻.Obstruction in the movement of Aprons during doffing in modern cards.并研究了两种不同的鞣制方法对皮板组织结构的影响.The effect of different tannage on structure of sheep skin was also studied....
The vibrating centrifugal dehydrator and scraper discharge centrifugal dehydrator are usually used in coal mine industry.振动离心脱水机与刮刀卸料离心脱水机是煤矿常用的两种离心脱水机.If a vibrating string is lightly touched at its midpoint , its pitch...