- A.零件号，零件名称
- B.零件号，供应商
- C.零件号，供应商所在地
- D.供应商，供应商所在地
正确答案及解析
正确答案
解析
正确选项为B。根据题意，零件P关系的主键为（零件号，供应商）。
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