已知单位向量满足，则 =/ananas/latex/p/20591/ananas/latex/p/48276/ananas/latex/p/958600
已知单位向量满足，则 =/ananas/latex/p/20591/ananas/latex/p/48276/ananas/latex/p/958600
1
已知单位向量满足，则 =/ananas/latex/p/20591/ananas/latex/p/48276/ananas/latex/p/958600