锁骨骨折的手术适应证是：（）
A.斜形骨折
B.粉碎性骨折
C.合并神经血管损伤者
D.有骨缺损者
E.畸形愈合者
参考答案：C
Not until __________ on TV __________ that the Chinese ship was rescued by the European Union Task Force.
A．did I turn; did I know
B．did I turn; I knew
C．I turned; did I know
D．I turned; I had known
在二乙氨基二硫代甲酸银比色法测定空气中的三氧化二砷及五氧化二砷时，用醋酸铅棉来消除某种物质的干扰。这种物质为（）。
A.HCl
B.SO2
C.SO3
D.H2S
E.O3
