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问题
填空题
公安决策是领导者复杂的（）活动。
答案
参考答案：思维
选择题
Some people haven't realized something as common as _____ to the sun for a long time will do harm to their skin and even cause skin cancer.
A. exposing
B. being exposed
C. having exposed
D. exposed
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单项选择题
早期鉴别强直性脊柱炎与其他脊柱疾病的最重要检查方法是（）
A.类风湿因子
B.HLA-B27
C.血沉
D.腰椎正侧位X线片
E.骨盆正侧位X线片
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