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【单选题】
据统计,重大交通事故,最常见受伤部位是?
A.
头颅 胸部
B.
头颅 四肢
C.
胸腹部 背部
D.
四肢 胸部
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【单选题】预应力筋在进行坐标定位时,其同排管道间距的允许偏差( )mm,上下层允许偏差( )mm。
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