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
子网数量为130，则选择subnet ID字段的长度值X=( )。
A．6
B．7
C．8
D．9
Everyone __________ quietly when suddenly a stranger __________ in.[ ]
A. was reading; rushed
B. was reading; was running
C. read; rushed
D. read; was rushing
