为自己加油

Airplane in improper landing configuration is indicated by two-tone siren aural, master warning lights, CONFIG light and EICAS message.以下哪项不能指示飞机不正常的降落形态

A.2种声音的警笛音响;
B.近地警告方式;
C.主警告灯;
D.CONFIG灯和EICAS信息;