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【单选题】
为了防止艾滋病传入我国,我国政府决定停止进口一切外国血液制剂,这种预防措施是()A.
控制传染病
B.
切断传播途径
C.
保护易感染人群
D.
保护传染源
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【多选题】用回弹仪检测结构物混凝土强度后,应确定测区混凝土强度换算值,换算时须有测强曲线,测强曲线的种类包括( )。
A.
统一测强曲线
B.
地区测强曲线
C.
专用测强曲线
D.
行业测强曲线
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