相当
如图所示,在纸面内有两根长直的平行绝缘导线A和B,它们都带有均匀分布的正电荷,当它们沿各自的直线向相反方向匀速运动时,绝缘线B所受磁力的方向是( ).
如图所示,在纸面内有两根长直的平行绝缘导线A和B,它们都带有均匀分布的正电荷,当它们沿各自的直线向相反方向匀速运动时,绝缘线B所受磁力的方向是( ).
如下图所示,从绕在铁心上的线圈AB的O点引出一个抽头,已知AO间的匝数为n1,BO间的匝数为n2.当BO间的交变电压为U2时,AB间的交变电压为( ).
如下图所示,从绕在铁心上的线圈AB的O点引出一个抽头,已知AO间的匝数为n1,BO间的匝数为n2.当BO间的交变电压为U2时,AB间的交变电压为( ).
She didn’t come to the party last Sunday. _____, she must have made the party more exciting.
She didn’t come to the party last Sunday. \_\_\_\__, she must have made the party more exciting.
We must begin testing the instrument no matter _____ difficult it is.
We must begin testing the instrument no matter \_\_\_\__ difficult it is.