引起慢性肺心病肺动脉高压最重要原因是
A.肺血增多
B.血液粘稠度增加
C.解剖学因素所致肺血管阻力增加
D.功能性因素所致肺血管阻力增加
E.高碳酸血症所致肺血管阻力增加
参考答案:D
Good heavens! There you are! We___anxious about you, and we ___you back throughout the night.
A.are; expect
B.were; had expected
C.have been; were expecting
D.are; were expecting
信用证的受益人是()
A.进口人
B.出口人
C.议付行
D.开证行