男,50岁。行右上6断根拔除术,术中断根突然消失,此时首先应做的是( )
A. 冲水吸根
B. 开窗取根
C. 拍X线片
D. 服抗生素
E. 扩大牙槽窝掏根
When Rulon won the Olympics, ()
A. some of his family watching
B. none of his family could afford to go
C. the people of Alton had no televisions to watch
D. his family was working on the farm
为防止发生化学变化,影响疗效,煎药用具不宜选
A. 砂锅
B. 瓦罐
C. 搪瓷罐
D. 铁锅
E. 不锈钢锅
引起心力衰竭的常见病因是
A. 肺动脉高压
B. 慢性贫血
C. 高血压
D. 冠心病、心肌梗死
E. 失血性休克