【单选题】As for a hydraulic vane pump, which of the following is in contact with the vanes during working: (1)the rotor; (2)the pump shaft; (3)the external suce of the housing.
【判断题】旧时王谢堂前燕,飞入寻常百姓家。出自刘禹锡的《乌衣巷》,对吗?
【单选题】A centrifugal impeller consists of a number of vanes curving ____ from the direction of rotation.
【简答题】肌内注射定义 ? 英文缩写? 2. 肌内注射,要回抽无回血吗? 3.2 岁以下婴幼儿肌内注射部位?
【单选题】患者,女性,53岁,风湿性心脏病多年,今日突然出现偏瘫,失语。入院检查:神志清楚,脑脊液正常,心电图显示为心房颤动。其最可能是并发了
【单选题】当b≤400mm,且一层内的纵向受压钢筋多于( )根时,应设置复合箍筋。