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【单选题】
Z11-01-07. 图中所示是从云室中拍摄的正电子和负电子的轨迹照片,均匀磁场垂直纸面向里,由两条轨迹可以判断 Z11-01-07 图
A.
a是正电子, 动能大.
B.
a是正电子, 动能小.
C.
a是负电子, 动能大.
D.
a是负电子, 动能小.
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