特发性肺纤维化动脉血气的主要改变是（）
A.PaCO2升高
B.PaO2降低
C.pH降低
D.BE正值增高
E.HCO3-降低
参考答案：B
“ _____ to Michelle and having two beautiful girls in my house never allows me to look down upon women,” said Obama．
A．Marrying
B．Being married
C．Having married
D．Married
建筑室内的声压级与哪些因素有关？
