The aural warning devices unit M315 provide an alarm bell when detected indications occur in the flight deck.in the above sentence,what is the meaning of " aural warning devices"?
A.过热探测器;
B.音响警告装置;
C.天花板;
D.固态电路板;
正确答案是B
The aural warning devices unit M315 provide an alarm bell when detected indications occur in the flight deck.in the above sentence,what is the meaning of " aural warning devices"?
A.过热探测器;
B.音响警告装置;
C.天花板;
D.固态电路板;
正确答案是B