套利模型：
1/ A = B，C = B，因此 A = C；
2/ A = B，C = B × (1 + 收益因子)，因此 A × (1 + 收益因子) = C
3/ A ≈ B × (1 + r_A)，C ≈ B × (1 + r_C)，因此：A ≈ C × (1 + rA) ÷ (1 + rC)
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