相对衰退是指行业内在的衰退规律起作用而发生的规模萎缩、功能衰退、产品老化。( )
参考答案：错
People should ask the police for help when they are ____. [ ]
A. in dangerous
B. in safety
C. in danger
D. in safe
“屈肘位截瘫”损伤的节段可能为（）
A.C3
B.C4
C.C5
D.C6
E.C7
