鳞癌可发生在以下哪些病变的皮损上（）
A.光线性角化病
B.盘状红斑狼疮
C.慢性溃疡
D.寻常狼疮
E.黏膜白斑
参考答案：A, B, C, D, E
The performance supposed to be popular______ to be a great disappointment after it was over.
A．turned up
B．turned down
C．turned out
D．turned over
不是水平往复炉排的优点是（）。
A.漏煤量小
B.煤层均匀松动，布风好
C.烟气携带飞灰量小
D.燃烧效率高
