做血气分析时,如血标本中混入气泡,可使PO2值(),PCO2值。
参考答案:升高;降低
To qualify yourself for this kind of new job, I recommend that you _____ some online courses.
A.to take
B.taking
C.take
D.would take
简述自由边境区与出口加工区的区别。