Did Jones’ lifelong dream come true
参考答案：Yes.
Let's put a bandage _________ your arm.[ ]
A. at
B. in
C. on
D. to
图中，闭合开关S后，通过螺线管与磁极间的磁感线形状如图所示，在图中用箭头标出磁感线的方向，并用“+”、“－、负极．
