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The error in a sextant altitude caused by refraction is greatest when the celestial body i..
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肝素和双香豆素抗凝特点有何不同?..
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其常见病因有A.动脉粥样硬化B.外伤C.感染D.囊性中层坏死E.....
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It was ______ midnight that we removed the trouble and went back to our cabin.A.untilB.not..
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使用无线调车灯显设备指挥调车时,除()外,任何人都无权发出.....
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膀胱三角位于膀胱底的内面,由____和____三者连线围成的光滑区域。..
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