人工呼吸时应按年龄给予一定频率的吹气。婴儿__________________次/分,儿童____________________次/分。
参考答案:30~40;20~24
Practising Chinese kung fu can not only _____ one's strength, but also develop one's character. [ ]
A. bring up
B. take up
C. build up
D. pull up
新生儿疾病筛查采血时间为出生()后,()之内,不宜超过()。