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【单选题】
以下涉及自行车车架的几种发明中哪些属于可授予实用新型专利权的主题?(2004年试卷四第13题)A.
现有的钢质材料的自行车车架用玻璃钢替代
B.
现有的自行车车架的整体材料不变，除了轴承座用特殊钢替代了普通钢
C.
现有的自行车车架外表面增加一层保护镀膜
D.
现有的自行车车架的钢质材料中添加入碳素成分
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