The children were playing on the ground, enjoying________, dirty but happy.
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She works very hard________as to find a well-paid job.
He did not do________his father had asked him to do.
哪项指标是判断人工气道的位置与通畅情况
A. 呼气末二氧化碳(PETCO2)
B. 二氧化碳分压
C. 氧分压
D. 脉搏血氧饱和度
E. 血气分析
采集动脉血气标本时，下列哪种因素会导致病人PaCO2升高
A. 疼痛
B. 恐惧
C. 烦躁不安
D. 标本中有气泡
E. 精神紧张
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