1.柱坐标系 如图,在柱坐标系中, ρ: _____ θ:______ z:___ 范围:ρ≥0,__≤θ<____, ____|OQ|∠xOQQP2π-∞+∞
|OQ|
∠xOQ
QP
2π
-∞
+∞