意甲竞猜首页|在中国 无人机中的苹果正成功飞起

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In April a group of Finnish farmers outfitted a spindly black drone with a remote-controlled chainsaw and filmed it decapitating snowmen. They called it “Killer Drone.” More formally it was a DJI S1000.四月,一群芬兰农民装备了一架细长黑色、具有遥控电锯的无人机并摄制下它斧头下雨人头部的画面。

意甲竞猜首页:双语科技百科(天文) 第15期:圭表

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The Gnomon圭表A simple and important astronomic instrument, the gnomon(an instru-ment used to calculate the time,season,and so on ) is composed of a vertical gnomon(about eight phi,or 2. 6 meters high ) and a horizontal ruler. It is designed to determine the length of a tropical year and the 24 Solar Terms. The rul-er has lines to indicate the months of the year.圭表是一种既非常简单又最重要的测天仪器,它由横向的表格(一般低八尺)和水平的圭构成。