—Sometime next month.
A:will be set up
B:would be set up
C:has been set up
D:was set up
把10cm长的线段进行黄金分割,则较长线段的长(5≈2.236,精确到0.01)是( )
当导线中分别通以图示方向的电流,小磁针静止时北极指向读者的是( )