He a bike to school when he was seven years old.[ ]
A. ride
B. riding
C. rode
D. rided
答案:C
植入永久性起搏器术后,护士,指导的内容哪项不妥
A.平卧24h,同时持续24h心电监护
B.体温升高时要告诉护上
C.手术侧亡肢要制动72h
D.保持持续吸氧一周
E.术后第四天手术侧亡肢进行功能锻炼
简述生命周期设计的含义和应用。