【判断题】The franchisee needs to pay an initial franchise fee and an annual 17% royalty.
【单选题】关于通电导线所受安培力F的方向,磁场B的方向和电流I的方向之间的关系,下列说法正确的是( )About the relationship between the direction of magnetic force F, the direction of magnetic flux denstiy B and the direction of current I, the following s...
A.
F、B、I三者必须保持相互垂直F. B and I must be vertical to each other
B.
F必须垂直B、I,但B、I可以不相互垂直F must be vertical to B and I, but B and I may not be vertical to each other
C.
B必须垂直F、I,但F、I可以不相互垂直B must be vertical to F and I, but F and I can not be vertical to each other
D.
I必须垂直F、B,但F、B可以不相互垂直,I must be vertical to F and B, but F and B may not be vertical to each other
【单选题】半径为R、通有稳恒电流 I的四分之一圆弧形载流导线bc,按图示方向置于均匀磁场B中,则下列描述导线所受安培力的大小和方向正确的是( )
【简答题】把长 0.3m 、通有 2A 电流的直导线放入磁感应强度为 1.5T 的匀强磁场中,当电流的方向与磁场的方向平行和垂直时,导向所受安培力各是多大?
【单选题】小儿有以下哪项表现应考虑有佝偻病的早期表现?
【单选题】关于通电导线所受安培力F的方向,磁场B的方向和电流I的方向之间的关系,下列说法正确的是( )
【单选题】半径为R、通有稳恒电流 I的四分之一圆弧形载流导线bc,按图示方向置于均匀磁场B中,则下列描述导线所受安培力的大小和方向正确的是( )【图片】
【判断题】The franchisee needs to pay an initial franchise fee and an annual 17% royalty.
【判断题】The right to the franchise is sold by the franchisor to the franchisee for an initial sum of money, often called the up-front entry fee, or franchise fee.
【单选题】通过大量的实验,人们总结出通电直导线所受安培力的方向和磁场方向、电流方向之间的关系 可以()判定