支气管扩张大咯血的病理基础是
A.感染所致粘膜充血水肿
B.病灶部位毛细血管通透性增高
C.动脉终末支扩张形成动脉瘤
D.慢性溃疡侵蚀肺小血管
E.支气管壁破坏
参考答案:C
Many experts think pigs are ______ to train than dogs or cats. [ ]
A. easier
B. much easy
C. more easily
D. too easy
湿空气是在显量不变的情况下,冷却到相对湿度等于()时所对应的温度,称为空气的()。