肺淤血最早出现的可靠X线征像是
A．肺纹理增加及模糊
B．上肺静脉扩张，与下肺野血管比例改变
C．肺水肿
D．胸腔积液
E．KerleyB线
参考答案：B
Our new science teacher comes from either New York or Washington. But I can’t remember _______.
A．where
B．there
C．which
D．that
沥青砂浆每层压实厚度不超过60mm。( )
