慢性盘状红斑狼疮皮肤损害的特征是
A.红斑
B.毛囊角质栓、鳞屑、角质栓
C.色素沉着和(或)色素减退
D.毛细血管扩张、萎缩和瘢痕形成
E.以上均是
参考答案:E
It is not_______ for me to return all the books to the library now because I still need them.
A.difficult
B.convenient
C.available
D.important
为了避免钻具从管架上滑落,导致人员伤害应如何操作?