艇体材料中既有刚性材料又有橡胶材料的救助艇被称为混合式救助艇。（）
参考答案：对
Which of the following interventions would be most helpful in preventing pressure ulcer formation in at-risk client
A．Massaging reddened areas on the sacrum.
B．Ensuring a generous fluid intake.
C．Repositioning every hour.
D．Providing a low protein diet.
脱敏牙膏有效成分是（）
A.氯化锶和硝酸钾
B.氟化亚锡
C.0.321%氟化钠及20%二氧化硅
D.中草药成分
E.三氯羟苯醚
