一般情况，内螺纹铜管米克重的变化是因为什么引起的：（）
A．钢球磨损
B．定径模磨损
C．旋压环磨损
D．螺纹芯头磨损
参考答案：A, C, D
A hospitalized client who has a living will is being fed through a nasogastric (NG) tube. During a bolus feeding, the client vomits and begins choking. Which of the following actions is most appropriate for the nurse to take（）
A. Clear the client’s airway.
B. Make the client comfortable.
C. Start eardiopulmonary resuscitation.
D. Stop the feeding and remove the NG tube.
工作区域的地面与墙面踢脚及所有阴角均应为（）设计
A、直角
B、钝角
C、弧形
D、无特殊要求
