A.1小時(shí)后較微頭痛 B.無(wú)癥狀反應(yīng) C.24小時(shí)后輕微頭痛 D.12小時(shí)后輕微頭痛
A.10MPa B.5Mpa C.3MPa D.1MPa
A.15m B.20m C.30m D.40m