关于脂肪瘤的说法,错误的是()
A.好发于四肢、颈、胸和背部
B.单个或多发
C.多位于皮下,能推动
D.易癌变
E.由成熟脂肪细胞组成
参考答案:D
Sorry, Madam. You' d better come tomorrow because it's ______ the visiting hours. [ ]
A. during
B. at
C. beyond
D. before
集控值班员应如何选择运行方式?