制图题：画出两根平行直导线，当电流沿相反方向流过时，导体受力的方向。
参考答案：
_______the police thought he was the most likely one,since they had no exact proof about it,they
could not arrest him.[ ]
A. Although
B. As long as
C. If only
D. As soon as
氯气干燥工序怎样去除NCl3？
