预防油膜振荡的措施?
参考答案:
1)增加轴承的比压。2)控制好润滑油温,降低润滑油粘度。3)将轴瓦顶部间隙减小到等于略小于两侧间隙之和。4)各顶轴油支管上加装逆止门。
患者男性,70岁,胸痛伴呕吐16h入院,心电图示下壁导联和右胸导联sT段抬高0.1~0.3mV,经补液后血压90/60mmHg,但病人出现头晕,神智模糊,心电图心率40次/分,为窦性心率,最恰当的药物是()
A.多巴胺
B.多巴酚丁胺
C.阿托品
D.心痛定
E.硝普钠
The teacher found her _____ and gave her some different homework to do every day. [ ]
A. was clever
B. was a clever girl
C. a clever girl
D. clever girl