画正等测图一般采用的轴向伸缩系数是（ ）
（A）p₁ = q₁ = r₁ = 0.82
（B）p₁ = q₁ = r₁ = 1
（C）p₁ = q₁ = 1.22, r₁ = 1
（D）p₁ = 1, r₁ = 0.5
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