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【单选题】
对世界喷气机事故统计表明,近十年,与航空维修相关的事故率是:A.
10%
B.
3%
C.
6%
D.
80%
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A.
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B.
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C.
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D.
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E.
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【单选题】为观察不同组织结构，下列哪窗技术是不正确的
A.
观察骨骼，窗位250Hu、窗宽2000Hu
B.
观察脑质，窗位35HU、窗宽100Hu
C.
观察腹部，窗位40Hu、窗宽300Hu
D.
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E.
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