下列哪项不是溃疡性结肠炎的手术适应证（）。
A.中毒性巨结肠
B.肠穿孔
C.癌变
D.暴发型溃疡性结肠炎
E.脓肿和瘘管形成
参考答案：D
The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
A．if
B．till
C．as
D．while
抗菌药物治疗的适应症（）
A、接受化疗的患者
B、较重的感染
C、无局限化的感染
D、配合手术治疗如骨髓炎等
D、手术时间长、暴露范围广的手术
