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

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

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A.只有E B.只有v C.只有G D.E、v和G均可算出

A.只有E B.只有v C.只有G D.E、v和G均可算出

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