【单选题】What is essential in making a modern car tougher to steal?
C.
A special cellphone signal.
D.
A GPS satellite positioning receiver.
【单选题】I'd like to buy a new car-modern, comfortable, and , with the best safety equipment. [ ]
【简答题】 A modern car for a modern driver.
【单选题】The controls of a modern car are criticized for being______.
【单选题】—Is the modern racing car outside ______, Laura? —Of course not. Nobody but Jim can afford such an expensive car. It must belong to ______.
【简答题】如图所示,在半径为a的无限长金属圆柱体内挖去一半径为b(b<a)的无限长柱体,两柱体轴线平行,轴间距为d[d<(a-b)],空心导体沿轴向通有电流I并沿截面均匀分布。 (1)求空腔内两柱体轴线连线上任一点的磁感应强度B x ; (2)证明空腔内磁场是均匀磁场。
【简答题】This day is recognized as the birthday of the modern car.
【单选题】–Is the modern racing car outside ______, Lucia? --Of course not. Nobody but Jim can afford such an expensive car. It must belong to ______.