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【单选题】
a 粒子(两个中子两个质子构成)与质子以同一速率垂直于磁场方向入射到均匀磁场中,它们各自作圆周运动的半径比 R a / R p 和周期比 T a / T p 分别为A.
1 和 2
B.
1 和 1
C.
2 和 2
D.
2 和 1
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