The remaining hearing loss after the exposure that does not fully recover to its preexposure level is known as permanent threshold shift (PTS). 聽性腦干反應(yīng)則分別在噪音暴露前、暴露后、暴露后1天、暴露后2天、或暴露后7天施行。
SNCV and MMCV ofulna and median nerves were prolon-ged in post-exposed groups comparedwith that in preexposure (p 鉛接觸組的正中及尺神經(jīng)運(yùn)動(dòng)NCV;正中及尺神經(jīng)感覺NCV;均較自身對(duì)照為慢(P
CDC is not recommending preexposure vaccination for unexposed veterinarians, veterinary staff, or animal control officers, unless such persons are involved in field investigations. CDC不建議對(duì)沒有暴露于疾病的獸醫(yī)、獸類醫(yī)療人員或動(dòng)物疾病控制官員進(jìn)行預(yù)接種，除非這些人進(jìn)行實(shí)地研究。
reliability preexposure and growth testing 可靠性摸底增長(zhǎng)試驗(yàn)