其轨道速度一定是在每秒几百米。Her orbital speed must be a few hundred meters per second.更为大型的卫星将被送入轨道。Yet bigger satellites will be sent up into orbit.这颗彗星的轨道与地球的轨道交叉。The orbit of this comet intersects the orbit of the Earth....
“ 屏蔽 ” 条件也叫做 “ 选通. ”The " mask " facility is also often called the " enable ".取补线路可任意选通减法器的输出或补取线路的输出.A complementing circuIt'selects either the subtracter output or the output of the complementing circuit.双向三极型可控硅 ...