【单选题】
Polyjet在打印时将（）通过几百甚至上千个喷头喷射到工作台上，然后利用配合工作的紫外光灯进行照射，使材料固化。
①
A.热敏聚合物
②
B.磁敏聚合物
③
C.光敏聚合物
④
D.液晶聚合物
【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
①
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②
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③
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④
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