The roof of the service wing is a segment of a cone with a larger radius at the top and a smaller radius at the bottom.
服务附楼的屋顶是一个圆锥的一部分，顶部半径大，底部半径小。
Cone head drive screw with washer - used on roof for keeping fixing holes watertight.
锥头机螺钉垫圈-用于屋顶保持固定孔水密。
Cone head drive screw with washer - used on roof for keeping fixing holes watertight.
锥头机螺钉垫圈-用于屋顶保持固定孔水密。
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