体外心脏按压频率：（）次／分钟。
A、80～100
B、70～80
C、50～60
D、60～80
参考答案：A
( )儿童在本阶段的主要发展任务是获得勤奋感而克服自卑感，体验着能力的实现。
A．婴儿期
B．学前期
C．学龄期
D．青年期
A．No alcohol is allowed in the hospital.
B．No smoking is allowed in the hospital.
C．The patient should wake up at 6:30 in the morning.
D．Only two people are allowed to visit the patient at one time.
