中有4个玻璃珠,其中2个红色,2个蓝色,玻璃珠除了颜色外其余特征均相同,若从此袋中任取2个珠子,试求取出都是蓝色珠子的概率(要求用树状图或列表法求解)。
解:P(蓝色)=。
海事部门对危险货物申报单位和装箱单位进行信誉类别评定,怎样算一个信誉类别评定年度?
The nurse is caring for a client who has a tracheostomy tube and is undergoing mechanical ventilation. The nurse can help prevent tracheal dilation, a complication of tracheostomy tube placement, by()
A. suctioning the tracheostomy tube frequently.
B. using a cuffed tracheostomy tube.
C. using the minimal air leak technique with cuff pressure less than 25 cmH2O.
D. keeping the tracheostomy tube plugged.