文件存储设备中,______不支持文件的随机存取。
A.磁盘
B.光盘
C.软盘
D.磁带
参考答案:D
Only when I left my hometown ________ how precious it is to me. [ ]
A. did I realize
B. I realized
C. had I realized
D. I had realized
良性叶状囊性肉瘤的声像图特点是
A.肿瘤边界清楚、完整、光滑
B.内部呈细点状回声,分布均匀,或为无回声区
C.后方回声增强
D.肿瘤巨大时,可呈囊状或分叶状
E.以上都是