单选题
发布日期:2021-03-22
bubbling refrigerant
overheating and oxidation
lowered operating temperatures
reducing the cloud or flash point
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发动机采用多气门结构后,排气门的直径可适当增大,使其工作温度相应降低,从而提高了发动机的可靠性。
下列关于每股收益指标的说法,正确的是( )
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为确保病人安全,实施静吸复合麻醉时必须()
铁工务(1995)144号文件规定,年通过总重为5000~8000万t·km/km的60kg/m钢轨,检查周期为()d。
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患者男性,68岁,腰椎CT示椎小关节间隙狭窄,内含气体,关节面增生,诊断为()
患者男性,55岁,因“左侧面部反复发作的剧烈电击样、针刺样、刀割样或撕裂样疼痛6个月”来诊。疼痛以面颊、上下颌及舌部更为明显,持续时间不超过2分钟,突发突止,间歇期完全正常 最可能的诊断是()
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