You'll see why very soon, in such a way that the derivative is this given unit vector u hat.
你很快就会明白为什么,导数dr/ds等于给定的单位u向量。
2
ASIP is a signals intelligence sensor payload developed by Northrop Grumman Mission Systems sector's Electromagnetic Systems Laboratory business unit for use on both the U-2 and Global Hawk.
We were in a standard I. C. U. unit. Steve, who generally disliked cutting in line or dropping his own name, confessed that this once, he'd like to be treated a little specially.