A.4M/3a,2M/3a B.-4M/3a,-2M/3a C.4M/3a,

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问题 A.4M/3a,2M/3aB.-4M/3a,-2M/3aC.4M/3a,-2M/3aD.-4M/3a,2M/3a

选项 A.4M/3a,2M/3a
B.-4M/3a,-2M/3a
C.4M/3a,-2M/3a
D.-4M/3a,2M/3a

答案 D

解析 分别选 C C‘和 B C为矩轴。
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