A.p<0.01MPa B.0.2MPa≤p≤0.4MPa C.0.4MPa≤p≤0.8MPa D.0.1MPa≤p≤0.2MPa
A.0.5m B.0.6m C.0.7m D.0.8m
A.12h B.24h C.48h D.72h