根据已知的三面投影选择对应的立体图形。 According to the given three side views, choose the correct object.

根据已知立体图形选择对应的三面投影。 according to the given pictorial drawing, choose the correct three side views.

根据轴测图与已知投影，补绘的a-a剖视图是正确的。 according to the given figures, the seciton view of a--a is right.

根据轴测图和已知投影，补绘的b-b阶梯全剖视图是正确的。 according to the given views and pictorial drawing , the full section of b--b is right.

根据轴测图和已知投影，补绘的a-a阶梯全剖视图是正确的。 according to the given views and pictorial drawing , the full section of a--a is right.

根据轴测图与已知投影，补绘的a-a剖视图是正确的。 according to the given views and the isometric drawing , the sectional view of a-a is right.

根据轴测图与已知投影，补绘的a-a剖视图是正确的。 according to the given drawings, the sectional view of a-a is right.

根据直线的投影，判定cd直线为侧垂线。 according to the given projections , the line of cd is regarded as a v-perpendicular line in space.

根据轴测图与已知投影，补绘的a-a剖视图是正确的。 according to the given views and the isometric drawing , the sectional view of a-a is right.

已知三面投影图，其对应立体为（ ）。 [图]A、[图]B、[图]C、...

根据物体的三面投影图判断，其对应的立体图是（ ）。[图]A...