十二烯基丁二酸，简称（）防锈剂，运行油中添加量为（）。
参考答案：746；0.02%～0.03%
It's said that more than 100 _______ will attend this meeting in Shanghai. [ ]
A. man teachers
B. woman teachers
C. men teachers
D. womans teachers
食管异物可出现的并发症不包括（）
A.颈部皮下气肿
B.纵隔气肿
C.气胸
D.咽侧脓肿
E.纵隔脓肿
