In setting the valves on a steam-smothering system on a tanker,the master control valve to cargo tanks should be().
A. open and individual tank valves open
B. open and the individual tank valves closed
C. closed and the individual tank valves closed
D. closed and the individual tank valves ope
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当测量基站阀控电池时,其不达标容量的电池达到整组数量的25%时,即需要整组更换。()
A. 正确
B. 错误
EEC的工作通道有几个()
A. 1个
B. 2个
C. 3个
D. 4个
女性,35岁,距骨骨折手法复位夹板固定已1个月,拍X线片示距骨有密度增高。治疗应()。
A. 延长固定时间
B. 立即拆除固定
C. 关节融合治疗
D. 剔除高密度骨
E. 立即行血管植入术