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【单选题】
—I’m very tired these days because of the senior high school entrance examination. —Why not______music? It can make you ______.
A.
listen to; relaxed
B.
to listen to; relaxed
C.
listen to; relax
D.
to listen to; to relax
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SELECT * FROM SAILORS WHERE LASTNAME<>'NULL'
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【单选题】某供应商关系模式为： Providler(PID，Pname，Tel，GoodsID，GoodsClas-sID, GoodsName，GoodsPrice) 该关系模式应满足以下函数依赖： PID→Pname，PID→TEL，GoodsID→GoodsClassID，GoodsID→GoodsName，GoodsName→GoodsPrice 则这个关系模式的主码为______。
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