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[单选题]
双字母信号“NC”代表的意义是()。
A.I must abandon my vessel
B.I require immediate assistance
C.I am sinking
D.I am in distress and require immediate assistance
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A.I must abandon my vessel
B.I require immediate assistance
C.I am sinking
D.I am in distress and require immediate assistance
A.骨导振子放置的位置对听阈有影响
B.骨导耳机作用于颅骨的压力大小会影响骨导听阈
C.当振子接触耳郭时,受试者也会把感觉到的振动当成信号,测得的听阈与真正的听阈有差距
D.无论骨导振子放在哪侧耳,通过骨导测得的听阈可代表双耳中好耳骨导听阈
E.骨导测试是双侧内耳参与反应