门静脉高压的始动因素为() ["门静脉血栓形成","肝窦压迫","肝动脉狭窄或闭塞","门静脉血流阻力增加","肝区肿瘤压迫"]
支配三角肌的神经是() ["胸长神经","桡神经","腋神经","肌皮神经","胸背神经"]
在图示四种应力状态中,关于应力圆具有相同圆心位置和相同半径者,有下列答案:() ["A.与D.","B.与C.","A.与D.及C.与B.","A.与B.及C.与D."]
下列哪项不属于职业性有害因素评价工作()。 ["环境监测","健康监护","职业流行病学调查","阈限值制订","生物监测"]
宜用中火炒至爆花的药物是() ["A.酸枣仁","B.水红花子","C.葶苈子","D.麦芽","E.栀子"]
简述增减负荷过程中,过热汽温的控制和调整方法。