第3题: [单项选择]What are the man and woman doing A. Listening to the radio. B. Looking at the photos. C. Watching television. D. Reading a newspaper. 参考答案:C 答案解析:W: There must be a thunderstorm in some place because the picture isn’’t very sharp and the sound is
第31题: [单项选择]如血气分析标本不能及时测定,需保存在有冰块的水中,其目的是() A. 防止CO2气体丧失 B. 防止糖代谢 C. 防止溶血 D. 防止血液浓缩 E. 防止O2气体丧失 参考答案:B 答案解析:血气标本中血细胞发生糖代谢会消耗氧气,产生二氧化碳,降低血液pH,从而影响血气检测结果的准确性,低温保存能够减少糖代谢。