慢性气管炎早期最可能发生的肺功能改变是
A．MVV降低
B．FEV1降低
C．MMFR降低
D．小呼吸道功能异常
参考答案：D
—Is the bag beautiful?
—Yes, at _____ it’s _____ the one you bought for me.
A．last; as bad as
B．least; no better than
C．last; not better
D．least; no worse than
洗油中萘含量对洗油质量有什么影响？
