In China, most schools are ________ schools. [ ]
A. mix
B. mixing
C. mixed
D. mixes
答案:C
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病人赵某,女,67岁,因肺源性心脏病收住院,护士巡视病房时,病人有明显的呼吸困难及口唇发绀,血气分析:PaO2为45mmHg,PaCO2为60mmHg。
当PaO2低于下列哪项值时,可作为用氧指标( )
A.30mmHg
B.40mmHg
C.50mmHg
D.60mmHg
E.70mmHg