On the sea near Diaoyu Island, ____ Chinese fishing boat was stopped by the Japanese and ___ sailors

were arrested illegally.[ ]

A. a; the

B. the; the            

C. a; 不填          

D. the; 不填

应急舵的操舵特点是：（）

①、无舵角反馈装置；

②、手柄直接控制舵机；

③、只能在机舱操作；

④、反馈装置控制机舱开关；

⑤、与随动舵相同

A.①、②

B.①、②、③

C.①、②、④

D.②、③、④、⑤