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【单选题】
SQL语言的功能包括数据定义、数据查询、()和数据控制。
A.
数据处理
B.
数据操纵
C.
数据联接
D.
数据字典
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A.
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B.
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C.
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A.
电磁转矩T与输出功率P之间的关系
B.
转速n与转差率S之间的关系
C.
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A.
杜仲
B.
珙桐
C.
枸杞
D.
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