梅尼埃病的主要病理改变是()。
A.蜗管扩张膨大
B.球囊扩张膨大
C.膜迷路破裂
D.螺旋器退行性变,血管纹萎缩
E.内淋巴囊之囊壁纤维化
参考答案:A, B, C, D, E
—Mom, may I play computer games just for a while?
—________!Dad is writing his paper.[ ]
A. Help yourself
B. It's up to you
C. Behave yourself
D. Go ahead
微型计算机的显示器显示西文字符时,一般情况下一屏最多可显示:
A.25行,每行80个字符
B.25行,每行60个字符
C.20行,每行80个字符
D.20行,每行60个字符