电荷的_______移动形成电流，我们把_____________________的方向规定为电流的方向．
定向；正电荷定向移动
简述自然决策的特征有哪些。
The client has a newly positive Mantoux skin test although she does not have active tuberculosis. Which medical therapy would be appropriate for her（）
A. Reevaluating the client’s condition every 6 months.
B. Performing a repeat skin test every 6 months.
C. Administering isoniazid for about 9 months.
D. Administering isoniazid until the skin test reverts to negative.
