简述何谓黏膜白斑
参考答案：黏膜白斑是指发生在口腔和外阴黏膜的增生性，白色角化性损害，因可继发鳞癌，通常认为是一种癌前病变。
— ______she have a pencil case?
—Yes, she does. [ ]
A. Do
B. Is
C. Does
D. Are
YB95型条盒透明纸包装机安装时要使有胶的一面接触拉线辊。
