【单选题】在图示机构中, O 1 A ∥ O 2 B , O 1 A > O 2 B , O 1 A ⊥ O 1 O 2 , w 1 ≠0, 则 w 1 w 2 。
【单选题】合成橡胶通常采用乳液聚合反应,主要是因为乳液聚合( )
【单选题】患者男性,55岁,有肝硬化病史10余年。近日食欲明显减退,黄疸加重。今晨因剧烈咳嗽突然呕咖啡色液体约1200ml,黑便2次,伴头晕、眼花、心悸。患者上消化道出血最可能的原因是( )
【简答题】I had to knock on the taxi to get his attention. Finally, the driver, a man about 60, looked up from behind the wheel and apologized, “I’m sorry, but I was reading a letter.” He sounded as if he had a...
【单选题】患者,男性,55岁。肝硬化病史5年。1年前胃镜检查显示食管胃底静脉中度曲张,未行规律治疗。6小时前进食后出现呕血,伴大汗、心慌,急诊入院。查体:Bp80/45mmHg,P124次/分,面色苍白,四肢冰冷,口唇发绀。为预防该患者并发肝性脑病,正确的处理措施是()
【单选题】The young driver looked over the engine carefully lest it ______ on the way.
【单选题】“不走极端、在两种相反和对立的观点中取中间的观点”指的是
【单选题】The young driver looked over the engine carefully for fear that it______ on the way.