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【单选题】
如果将下图所示的E-R图转换成关系模型,则可以转换为几个关系模式( )。
A.
1个
B.
2个
C.
3个
D.
4个
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举一反三
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【单选题】肾上腺素不具备下列哪种作用
A.
使组织液生成减少
B.
使心肌收缩力加强
C.
使心率加快
D.
使内脏皮肤血管收缩
E.
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A.
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B.
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【单选题】肾上腺素不具备下列哪种作用
A.
使心肌收缩力加强
B.
使心率加快
C.
使内脏皮肤血管收缩
D.
使骨骼肌血管舒张
E.
使组织液生成减少
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