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[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.
[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.
[单选题]设a,b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=()。A.0B.C.D.
[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.
[单选题]设a,b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=()。A.0B.C.D.
[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.
[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.
[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.
[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.
[单选题]设a、b为非零向量,且满足(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),则a与b的夹角θ=( )。A.0B.C.D.