The nurse is providing preoperative care to a client scheduled for an appendectomy. Which statement regarding pain control is most appropriate

A. "There’s no need to ask for pain medication, you’ll receive it on a schedule. "
B. "Take your pain medication after walking so that you won’t feel dizzy. "
C. "Take your pain medication before your pain becomes intense. "
D. "Use as little pain medication as possible to avoid addiction. "

化学与人类的生活密切相关，下面是小洁同学用连线方式对某一 主题知识进行归纳的情况，其中不正确的是 [     ]

A．化学与材料：制作雨衣的材料--具有热塑性；制作电源插座 的材料--具有热固性

B．化学与生产：农作物叶色淡绿--施用氮肥；硝酸钾--复合肥料

C．化学与健康：人体缺少氟元素--易患龋齿；亚硝酸钠--误食能使人中毒死亡

D．化学与能源：酒精--化石燃料；汽油--化石燃料