【单选题】【消耗次数：1】
肩肱节律肱骨跟肩胛骨的活动度比是
①
2:1
②
1:2
③
2:3
④
3:2
参考答案：
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相关题目
【简答题】
设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则交关系A∩B等于：[填空1]
【简答题】
设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则求差关系A-B。
【简答题】
设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则对称差关系A⊕B等于：[填空1]
【判断题】
设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则并关系A∪B的定义域dom(A∪B)等于：{1,2,3,4}。
①
正确
②
错误
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