某个涉外单位邀请的外国人持可停留90天的F签证于2010年3月7日入境后,如果每次到期前申请延期3个月的F签证,最多可以申请多少次?()
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视神经不会发生下列哪种肿瘤()。
A. 视神经脑膜瘤
B. 视神经鞘瘤
C. 视神经胶质瘤
D. 视神经纤维瘤
E. 以上都不对
HDTV电视画面的清晰度在()像素左右。
A. 20万
B. 40万
C. 100万
D. 200万
An administrator is installing AIX 6.1 on a new LPAR and the boot sequence has stalled with reference code 0c31. What is the most likely cause?()
A. The system is waiting for user input to define console type lft0.
B. The system is waiting for user input to define console type tty0.
C. The system is waiting for user input to define console type vty0.
D. The system is waiting for user input to define console type vsa0.