first copy speed 首张复印速度
first speed gear [机] 头档齿轮 ; 一速齿轮
first speed 初速 ; 一速
first speed range 一速范围
first speed clutch 一速离合器
first speed forward 前进一速
first speed sliding gear 一速滑移齿轮
first speed clutch group 一速离合器组件
He says a new system is needed to meet the speed and complexity of a twenty-first century global economy.
VOA: special.2009.06.19
c We know it's very specific for light because in this equation is c, the speed of light. So any time you go to use this equation, if you're trying to use it for an electron, just ask yourself first, does an electron travel at the speed of light?
我们知道它只对光适用是因为在这个方程里有,光速,所以下次你们用这个方程前,如果你们要把它用到一个电子上,先问问你自己,电子的运动速度是光速吗?
The first plane ever to fly faster than the speed of sound was the X-1 in nineteen forty-seven.
VOA: special.2010.07.07
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