1) Threshold shift
阈移
2) hearing threshold shift
听力阈移
1.
Methods:Continuous noise of a tank during moving and impulse noise at shooting in the field as well as hearing threshold shift of crew in tank were measured.
结果 :行驶时连续噪声为 10 7～ 112dB(A) ,能量主要集中在 30 0Hz左右 ;炮击时车内脉冲噪声为 16 7～ 172dB(P) ,B -持续时间多为 30 0～ 4 0 0ms ,3h作业后乘员有轻度听力阈移。
3) permanent threshold shifting
永久性阈移
1.
Results The permanent threshold shifting(PTS) was caused after 8 Hz and 12 Hz 130 dB infrasound exposure for 30 h and temporary threshold shifting(.
结果:8 Hz和12 Hz的次声在130 dB暴露30 h均可引起豚鼠的永久性阈移(PTS)。
4) Transient threshold shift
暂时性阈移
补充资料：城阈
1.犹城门。代称城郭。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。