【单选题】【消耗次数:1】
骨牵引应预防针孔感染,每日在针孔滴( )酒精1—2次。
50%
70%
80%
60%
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相关题目
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【单选题】 设一个关系模式为R(A,B,C),对应的关系内容为R={{1,10,50}, {2,10,60}, {3,20,72}, {4,30,60}},则ПB(δC70(R))的运算结果中具有的元组个数为( )。
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①  For
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①  by
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①  am
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