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

题目

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