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大脑缺氧耐受时间4-6分钟

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1.成人胸外按压的陈述，正确的是（）

A按压频率每分钟至少100次
B胸骨下陷不超过5cm
C. D胸骨下压时间长于放松时间
D. D胸骨下压时间长于放松时间

Some people believe fast and loud music is ______ and help people have fun.

point along an ever increasingly harder route. While not an Olympic event, rock climbing is 3. by the International Olympic Committee as a sport. Rock climbing has been

______ several different styles and sub-disciplines. At its most basic, rock climbing