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【多选题】

设置选项让曲面透明和无边界框去观察马鞍面(双曲抛物面)

A.
Plot3D[x^2-y^2,{x,-3,3},{y,-3,3}, PlotStyle → Opacity[0.2],BoxRatios → {1,1,1}]
B.
Plot3D[x^2-y^2,{x,-3,3},{y,-3,3}, BoxRatios → {1,1,1},PlotStyle → Opacity[0.3]]
C.
Plot3D[x^2-y^2,{x,-3,3},{y,-3,3}, PlotStyle → Opacity[1.0],BoxRatios → {1,1,1}]
D.
Plot3D[x^2-y^2,{x,-3,3},{y,-3,3},BoxRatios → {1,1,1}, PlotStyle → Opacity[0.25]]
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【单选题】设S是抛物面z=x2+y2在第一卦限中介于z=0,z=2之间部分的下侧,则∫∫szdxdy=()

A.
-∫02πdθ∫02ρ3dρ
B.
-∫0π/2dθ∫0√2ρ3dρ
C.
∫0π/4dθ∫0√2ρ2dρ
D.
-∫0π/2dθ∫0√2ρ2dρ