A.每次使用后 B.一天結(jié)束時 C.周末 D.有空時
A.季胺類殺菌劑(quays) B.螯合皂(chelating soaps) C.漂白劑(bleach) D.脫脂劑(degreaser)
A.血案(blood event) B.暴露事故(exposure accident) C.暴露事件(exposure event) D.暴露事件(exposure incident)