伤寒出现肝脾肿大的主要原因是()
A.全身单核-巨噬细胞系统增生性反应
B.伤寒性引起肝硬化,继而脾大
C.Ⅰ型变态反应
D.Ⅲ型变态反应
E.中毒性肝炎
参考答案:A
Whatever she said, she couldn't make herself ____. [ ]
A. understand
B. to understand
C. understanding
D. understood
油气冷凝器一般来说,管程介质是油气,壳程介质是水。