10kv系统属于().
A.大电流接地
B.小电流接地
C.都可以
参考答案:B
质点由西向东运动,从A点出发到达C点再返回B点静止,如图,若AC=100m,BC=30m,这一过程中质点的位移大小为 m,方向
The place where the goods are produced is______
A. place of origin
B. place of order
C. place of interest
D. place of issue