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【单选题】
18世纪,欧洲人先把玻璃液吹成一个皇冠状或者空心球状,再放在在一个快速旋转的平板中心重新加热,利用离心力将其展开铺平,形成一块直径1.5米左右的玻璃圆板,较为平薄的边缘就切成合适的形状做窗玻璃,中间的圆形凸起就是透镜这种工艺做出的玻璃称为A.
冕牌玻璃
B.
燧石玻璃
C.
水晶玻璃
D.
石英玻璃
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