在检查燃油箱渗漏时，当燃油浸润滑石粉的直径在1.5-3英寸之间是属于：（）.
A.缓慢渗漏
B.渗漏
C.严重渗漏
D.连续渗漏
参考答案：C
Athletes from the new nation of South Sudan ______ under the Olympic flag for the first time in the
2012 Olympic Games. [ ]
A. compete
B. will compete
C. competed
D. have competed
视网膜剥离症发生在（）
A.角膜
B.巩膜
C.房水
D.视网膜视部
E.玻璃体
